Understanding the correct towing limits for horse trailers is highly important from a safety and legal perspective – but it’s a topic that often causes heated discussion as many drivers interpret the rules differently.
For a set-up to be correct both the towing vehicle and the trailer need to be considered – and you must not exceed the vehicle’s gross train weight (GTW) or the trailer’s maximum authorised mass (MAM). Vehicles and most trailers will have a weight plate, displaying the GTW or MAM. These can also be found in the vehicle handbook, and on some trailer manufacturer’s websites.
Confusion can arise where people assume that a big vehicle has a large GTW – which is not always the case. Similarly, some might assume that a vehicle with a large GTW – for example many pick-ups – will always be able to carry two big horses, but this is dependent on the trailer’s MAM; a trailer may be stalled for two but the MAM might not be great enough for two heavy horses.
How much can my vehicle tow?
The DVSA provided the below guidance to H&H to help owners understand weight plates and work out how much their vehicle can tow.
Understanding towing vehicle weight plates
Most vehicles display a manufacturer’s weight plate under the bonnet or on the door frame. It typically shows:
Gross vehicle weight (GVW)
Gross train weight (GTW)
Maximum front and rear axle weights
The GTW is especially important when towing as it sets the maximum combined weight of the vehicle, trailer, and load.
An example of a vehicle weight plate.
(Image credit: creditUnknown)
Understanding trailer towing weight plates
A trailer’s plate usually displays:
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Maximum authorised mass (MAM)
Unladen (empty) weight
Axle weight limits
The MAM must never be exceeded, even if the towing vehicle is capable of towing more.
An example of a horse trailer weight plate.
(Image credit: creditUnknown)
What is load weight?
Load weight refers to anything the trailer carries: the horse, tack, water, hay, equipment and any other items. To tow safely, you must:
Ensure total load + unladen weight does not exceed the trailer MAM
Ensure the combined vehicle and trailer weight does not exceed the GTW
Balance load correctly to avoid instability or sway
How to work out how much your vehicle can tow
Below is the DVSA’s advice on how you can accurately establish how much your vehicle can tow, taking into account factors such as the horse, passengers, equipment and water.
1. Check the vehicle’s maximum permissible towing capacity
This is set by the manufacturer and can be found in the vehicle handbook or on the weight plate.
2. Identify the trailer’s plated weights
A trailer plate will display its MAM
3. Estimate load weight
Add together:
Horse weight
Passengers
Tack, feed, bedding, and equipment
Water and any additional carried items
4. Compare actual weight against limits
Ensure the total does not exceed either of the following:
The vehicle’s maximum permissible towing capacity
The trailer’s MAM
Any combination or gross train weight limits
If you are ever unsure, you can take your vehicle to a public weighbridge to check the weight.
To summarise:
The GTW is the maximum weight of the:
Towing vehicle
Trailer
And everything loaded into the towing vehicle and trailer
The weight of the load carried on the trailer, combined with the weight of the trailer itself, must not exceed the MAM of the trailer.
Importance of adhering to legal towing weight limits
Towing beyond the legal weight limits is a significant safety risk. Exceeding the MAM of either the towing vehicle, the trailer, or the overall combination can:
Reduce vehicle stability and increase stopping distances
Since joining H&H in 2018, Becky has covered a broad range of equestrian news including welfare matters, veterinary studies, FEI Tribunal hearings and road safety campaigns. She has also interviewed top riders including Scott Brash, John Whitaker and Ian Stark, to name just a few. Becky’s reporting has taken her to Canada for Spruce Meadows and France for Pau five-star, as well as the Royal Highland and Blair Castle International Horse Trials closer to home. She was also a key part of the remote reporting team for the Tokyo Olympics and the Europeans.
