How Much Weight Can Your Car Actually Tow? A Simple Way to Check

Planning to tow a caravan, horsebox, trailer or boat? Before you hitch up and set off, it’s essential to know how much your car can tow. Exceeding your vehicle’s towing capacity can affect handling, increase braking distances, damage your vehicle and even put you on the wrong side of UK regulations.

The good news is that checking your towing capacity is much easier than many drivers realise. Your vehicle already provides the information you need, you simply need to know where to look and how to interpret it.

In this guide, you’ll learn what towing capacity actually means, how to find your car’s towing limit, what the different weight figures on your VIN plate represent, and the common mistakes to avoid before towing. 

If you’re unsure about your vehicle’s towing capacity or need advice on choosing the right towbar, the experienced team at A&S Towbars can help you identify the correct towing solution for your vehicle and intended use.

What Does Towing Capacity Actually Mean?

Towing capacity is the maximum weight your vehicle is designed to tow safely, as determined by the manufacturer. This figure takes into account the vehicle’s engine, transmission, braking system, suspension, chassis, cooling system, and overall structural design.

In simple terms, it answers one important question:

How much can my car tow safely and legally?

Your towing capacity is not an estimate or recommendation, it is a manufacturer-approved limit that should never be exceeded. Every vehicle is engineered differently, so even two models that look nearly identical can have very different towing capabilities due to differences in engine size, drivetrain, gearbox, or trim level.

For example, a diesel SUV may comfortably tow a large caravan, while the petrol version of the same model may have a significantly lower towing capacity.

Why Do Manufacturers Set Towing Limits?

Manufacturers calculate towing capacity after extensive testing under controlled conditions. These tests assess how the vehicle performs when accelerating, braking, cornering, climbing steep hills, and coping with emergency manoeuvres while towing.

Several factors influence your vehicle’s towing capacity, including:

• Engine power and torque
• Transmission strength
• Braking performance
• Suspension design
• Chassis construction
• Cooling system efficiency
• Wheelbase and vehicle stability

Ignoring these limits places additional stress on your vehicle and may reduce your ability to control it, particularly in poor weather or emergency situations.

Maximum Doesn’t Always Mean Ideal

One of the biggest misconceptions is that if your vehicle is rated to tow its maximum capacity, you should always do so.

In reality, experienced towers often recommend leaving a reasonable safety margin where possible. While your vehicle may legally tow its maximum rated weight, towing slightly below that limit can improve handling, braking performance, fuel efficiency, and overall stability, especially when travelling long distances or on hilly roads.

Factors such as passengers, luggage, roof-mounted accessories, and adverse weather conditions can all affect how your vehicle performs while towing.

How to Find Your Car’s Towing Capacity

If you’ve ever searched online for “how much can my car tow”, you may have found several different answers. The most reliable information always comes from your vehicle’s manufacturer.

Fortunately, there are several simple ways to find your towing capacity.

1. Check Your Vehicle’s VIN Plate

The quickest and most accurate place to start is your vehicle’s Vehicle Identification Number (VIN) plate, sometimes referred to as the manufacturer’s plate.

Depending on your vehicle, you’ll usually find it:

• Inside the driver’s door frame
• Under the bonnet
• In the engine bay
• On the driver’s side B-pillar

The VIN plate contains several important weight figures that help determine your towing limits.

2. Understand the Weight Figures

Many VIN plates include four weight values. Although they may look confusing at first, they’re straightforward once you know what they mean.

The two most important figures are:

• Gross Vehicle Weight (GVW): The maximum permitted weight of your fully loaded vehicle, including passengers, fuel, luggage, and accessories.
• Gross Train Weight (GTW): The maximum combined weight of your loaded vehicle and trailer.

In many cases, you can estimate your maximum trailer weight using this calculation:

Gross Train Weight − Gross Vehicle Weight = Maximum Trailer Weight

For example:

• Gross Train Weight: 5,500 kg
• Gross Vehicle Weight: 3,000 kg

Maximum towing capacity = 2,500 kg

While this provides a useful reference, always confirm your vehicle’s official towing capacity using the manufacturer’s handbook or specifications, as there may be additional restrictions for your exact model.

3. Check the Owner’s Handbook

Your owner’s manual usually lists both the braked towing capacity and unbraked towing capacity for your vehicle.

This is particularly useful because it also highlights any specific towing recommendations made by the manufacturer, such as speed limitations or equipment requirements.

4. Use the Manufacturer’s Website

Many manufacturers allow you to look up your vehicle’s specifications using your registration number or VIN.

This is especially useful if:

• You’ve purchased a used vehicle.
• Your handbook is missing.
• Your vehicle has several engine options.
• You want to verify the specifications before purchasing a trailer or caravan.

Understanding the Different Vehicle Weight Terms

One reason many drivers struggle to determine how much their car can tow is the amount of technical terminology involved.

Understanding a few key weight terms makes towing much easier.

Weight Term	What It Means	Why It Matters
Gross Vehicle Weight (GVW)	Maximum loaded weight of the vehicle	Prevents overloading the vehicle
Gross Train Weight (GTW)	Maximum combined weight of vehicle and trailer	Determines towing limit
Kerb Weight	Weight of the empty vehicle with fuel	Useful when matching caravans
Payload	Combined weight of passengers, luggage and cargo	Reduces available carrying capacity
Nose Weight	Downward force applied by the trailer to the towball	Affects towing stability
Maximum Authorised Mass (MAM)	Maximum legal operating weight	Ensures legal compliance

Gross Vehicle Weight (GVW)

Gross Vehicle Weight represents the maximum weight your vehicle can safely carry.

This includes:

• Driver and passengers
• Fuel
• Luggage
• Roof boxes
• Bike racks
• Any other cargo

Exceeding your GVW places unnecessary strain on your suspension, tyres, and braking system.

Gross Train Weight (GTW)

Gross Train Weight is one of the most important figures for anyone towing.

It represents the combined maximum weight of:

• Your fully loaded vehicle
• Your fully loaded trailer

Even if your trailer is within its own weight limit, the combined weight of both vehicle and trailer must remain below the GTW.

Kerb Weight and Payload

Kerb weight refers to the weight of the vehicle with fuel and essential fluids but without passengers or luggage.

Payload includes everything you add to the vehicle after manufacture, including people, pets, camping equipment, tools, and other cargo.

While payload doesn’t directly change the manufacturer’s towing capacity, it contributes to your vehicle’s total operating weight and should always be considered when towing heavy loads.

Braked vs Unbraked Trailers: What’s the Difference?

Not all trailers are built the same, and this directly affects how much your vehicle can tow.

Braked Trailers

A braked trailer has its own braking system that operates automatically when the towing vehicle slows down.

Because the trailer helps with braking, vehicles can usually tow significantly heavier loads when using a braked trailer.

This makes them suitable for:

• Large caravans
• Horseboxes
• Boat trailers
• Plant trailers
• Heavy commercial trailers

Unbraked Trailers

An unbraked trailer has no independent braking system.

Since the towing vehicle must provide all the braking force, manufacturers impose much lower towing limits.

Small utility trailers and lightweight domestic trailers are common examples.

Why the Difference Matters

Many manufacturers publish two towing capacities:

• Maximum braked towing capacity
• Maximum unbraked towing capacity

Always check which figure applies before towing. Choosing the wrong trailer type could mean exceeding your vehicle’s approved limits, even if the trailer appears relatively small.

What Can Reduce Your Real Towing Capacity?

Your vehicle’s published towing capacity is an important starting point, but it doesn’t tell the whole story. While the manufacturer’s limit is the maximum weight your car is designed to tow, several real-world factors can affect how safely and comfortably your vehicle handles a trailer.

Understanding these factors can help you make better towing decisions and reduce unnecessary strain on your vehicle.

Passengers and Luggage

Although passengers and luggage don’t officially reduce the manufacturer’s towing capacity, they do increase your vehicle’s overall weight. Every additional person, suitcase, toolbox, or piece of camping equipment contributes to your Gross Vehicle Weight (GVW).

A heavily loaded vehicle will naturally feel different to drive when towing, particularly during braking, cornering, or travelling uphill.

Roof Boxes and Bike Racks

Roof boxes and bike carriers are popular accessories for family holidays, but they also affect vehicle dynamics.

Additional weight mounted higher on the vehicle raises its centre of gravity, which can slightly reduce stability, especially in strong crosswinds or when towing a caravan.

Before fitting roof-mounted accessories, always check your vehicle’s maximum roof load as well as your towing limits.

Aftermarket Accessories

Bull bars, roof tents, heavy-duty storage systems, recovery equipment, and other accessories all add weight to your vehicle.

While these upgrades may improve practicality, they also contribute to your overall payload and should be considered when preparing to tow.

Road and Weather Conditions

A vehicle towing its maximum rated capacity on a dry, flat motorway behaves very differently from one travelling through heavy rain, steep hills, or strong winds.

Conditions that may affect towing performance include:

• Steep inclines
• Wet or icy roads
• Strong crosswinds
• High temperatures
• Uneven road surfaces
• Long downhill descents

Reducing speed and leaving additional braking distance becomes even more important under these conditions.

Practical Example

Imagine your SUV has a maximum braked towing capacity of 2,000 kg.

You’re preparing for a family holiday with:

• Four passengers
• Camping equipment
• A fully loaded roof box
• Bicycles on a rear carrier
• A caravan approaching the maximum towing limit

While the caravan may still fall within the vehicle’s legal towing capacity, the additional load can significantly affect handling, braking, and fuel consumption. Leaving a sensible safety margin rather than towing at the absolute maximum can provide a more comfortable and controlled driving experience.

Common Towing Mistakes to Avoid

Even experienced drivers occasionally misunderstand towing limits. Avoiding these common mistakes can improve safety and help protect your vehicle.

Confusing Payload with Towing Capacity

Payload and towing capacity are different measurements.

Payload refers to what your vehicle carries inside and on top of it, while towing capacity refers to the weight being pulled behind it.

Understanding the distinction helps prevent overloading your vehicle.

Ignoring Nose Weight

Nose weight is the downward force the trailer applies to the towball.

Too much nose weight can overload the rear suspension, while too little may reduce trailer stability and increase the risk of snaking.

Always follow both your vehicle manufacturer’s and towbar manufacturer’s recommended nose weight limits.

Assuming Every Model Can Tow the Same Weight

Different engine sizes, transmissions, and trim levels often have different towing capacities, even within the same model range.

Never rely solely on information from another owner’s vehicle.

Forgetting the Towbar Rating

Your towbar should always be compatible with your vehicle and appropriately rated for the loads you intend to tow.

A professionally fitted towbar ensures compatibility, safety, and compliance with manufacturer recommendations.

Skipping Regular Equipment Checks

Before every journey, inspect your:

• Towball
• Trailer coupling
• Electrical connections
• Trailer lights
• Tyres
• Safety cable
• Braking system (where applicable)

Routine inspections only take a few minutes and can help prevent costly problems later.

Can Your Car Tow a Caravan, Horsebox or Trailer?

One of the most common questions drivers ask is whether their vehicle can tow a particular type of trailer.

The answer depends on your exact vehicle specification and the trailer’s fully loaded weight.

Caravans

Modern caravans vary considerably in weight.

Smaller touring caravans may weigh around 1,000 kg when loaded, while larger twin-axle caravans can exceed 2,000 kg.

Always compare the caravan’s Maximum Authorised Mass (MAM) with your vehicle’s towing capacity.

Horseboxes

Horse trailers present unique challenges because horses move during transport, affecting weight distribution and stability.

Remember to include:

• Trailer weight
• Horse weight
• Tack
• Feed
• Equipment

Utility Trailers

Utility trailers are commonly used for:

• Garden waste
• Furniture
• DIY materials
• Motorcycles
• Landscaping equipment

Many lightweight utility trailers are unbraked, making it particularly important to check your vehicle’s unbraked towing limit.

Boat Trailers

Boat trailers should always be assessed using the combined weight of:

• Boat
• Trailer
• Fuel
• Engine
• Equipment
• Batteries

Many owners underestimate the total towing weight by considering only the boat itself.

Plant Trailers

Commercial plant trailers often carry heavy machinery and equipment.

Businesses should pay particular attention to manufacturer limits, towbar ratings, and proper load distribution before transporting excavators, generators, or other machinery.

Choosing the Right Towbar for Your Vehicle

Selecting the correct towbar is just as important as understanding your towing capacity.

The right towbar depends on how frequently you tow and what you intend to transport.

Fixed Towbars

Fixed towbars remain permanently attached to the vehicle.

They’re an excellent choice for drivers who:

• Tow regularly
• Want maximum convenience
• Need a cost-effective solution

Detachable Towbars

Detachable towbars can be removed when not in use, helping preserve the vehicle’s appearance while still providing excellent towing performance.

They’re popular among drivers who only tow occasionally.

Swan Neck vs Flange Towbars

Both towbar styles offer reliable performance but suit different requirements.

Swan neck towbars provide a cleaner appearance and are commonly chosen for caravans and bike racks.

Flange towbars are highly versatile and support a wider range of towing accessories, making them popular for commercial applications.

If you’re unsure which towbar best suits your vehicle, A&S Towbars can recommend an option based on your vehicle, towing requirements, and manufacturer specifications.

Safe Towing Checklist Before Every Journey

Before setting off, take a few minutes to complete this simple safety check:

✔ Confirm your vehicle’s towing capacity.

✔ Check the trailer’s fully loaded weight.

✔ Verify the nose weight.

✔ Inspect tyre pressures on both vehicle and trailer.

✔ Test trailer lights.

✔ Confirm electrical connections are secure.

✔ Inspect trailer brakes if fitted.

✔ Secure all loads properly.

✔ Check mirrors provide adequate rear visibility.

✔ Ensure the trailer coupling is correctly locked.

✔ Verify the breakaway cable or safety chain is correctly attached.

✔ Confirm your number plate is clearly visible.

Developing a consistent pre-journey routine can significantly improve towing safety and reduce the likelihood of breakdowns or incidents.

When Should You Speak to a Towbar Specialist?

Although many towing questions can be answered using your vehicle handbook, professional advice is worthwhile if:

• You cannot locate your VIN plate.
• Your vehicle has been modified.
• You’re purchasing your first towbar.
• You tow different types of trailers.
• Your vehicle has multiple engine options.
• You’re unsure which electrical system you require.
• You need towing equipment for commercial use.

An experienced installer can confirm compatibility and ensure your towing setup meets manufacturer recommendations.

Tow with Confidence Using the Right Equipment

Knowing how much your car can tow is one of the most important steps towards safe, confident towing. By checking your VIN plate, understanding key vehicle weight terms, and following the manufacturer’s recommendations, you can avoid costly mistakes while protecting both your vehicle and everyone on the road.

Just as importantly, choosing the right towbar ensures your towing setup is compatible with your vehicle and suitable for the loads you intend to carry.

If you’re unsure about your vehicle’s towing capacity or need expert advice on selecting the right towbar, A&S Towbars is here to help. Explore our towing solutions and professional towbar fitting services at www.astowbars.co.uk, call us on 0800 211 8076, or email sales@astowbars.co.uk. Our experienced team will help you find the right towing solution, so you can tow with confidence every journey. 

 

Frequently Asked Questions

How do I know how much my car can tow?

Check your owner’s handbook, VIN plate, or the manufacturer’s official specifications. These provide the approved towing limits for your specific vehicle.

What’s the difference between braked and unbraked towing capacity?

Braked trailers have their own braking system and are generally permitted to carry heavier loads than unbraked trailers.

Does carrying passengers affect towing?

Passengers increase your vehicle’s overall weight and should be considered when loading your vehicle for towing, even though they don’t change the manufacturer’s towing capacity.

Can electric vehicles tow?

Some electric vehicles are approved for towing, while others are not. Always check the manufacturer’s published specifications for your exact model.