Trailer Number Plates: Why They Must Match Your Towing Vehicle
Your trailer number plate must match the registration of the vehicle towing it. Whether you are borrowing a trailer for a tip run, collecting a second-hand purchase or heading away with a caravan, check the registration before you set off. A plate left behind by the previous owner or last person to tow it may be the wrong one for your journey.
Which registration should a trailer number plate show?
For ordinary UK towing, use the registration currently assigned to the towing vehicle. The trailer owner’s registration is only correct if their vehicle is the one pulling it. GOV.UK confirms this requirement in its guidance on trailers and towing equipment.
For example, if your car displays NP55 NPS, the rear plate on the trailer should also display NP55 NPS. Before hitching up, compare both registrations character by character rather than assuming the fitted plate is correct.
Borrowing, hiring or buying a trailer
A borrowed trailer may arrive with your friend’s plate attached. A hired trailer may have a holder ready for your own plate. A used trailer may still carry its previous owner’s registration. In each case, arrange the correct plate for your towing vehicle before using it on the road.
Ask about the plate holder and fixing method when arranging collection. Having the right registration ready is much easier than discovering the mismatch after the trailer is loaded.
What if two vehicles use the same trailer?
Check the plate every time you change tow vehicles. If your household or business uses more than one vehicle, keep a clearly labelled trailer plate for each and fit the appropriate one before departure. A secure, suitable plate holder can make changes easier.
The same check matters after changing your car or transferring a private registration. Once the towing vehicle’s registration changes, an old matching trailer plate will need replacing too.
What should a replacement trailer plate look like?
A modern rear plate needs black characters on a reflective yellow background, the correct character format and spacing, and the required supplier and British Standard markings. Do not use a handwritten sign or alter the spacing to make a registration read differently. See the official number plate rules for full details.
Number Plate Supply offers flat printed plates in one standard rectangular size: 520 mm × 111 mm. Measure your trailer’s mounting space before ordering. If it needs a different size or shape, our standard plate may not be suitable.
Do you need documents to order a trailer number plate?
Ordering an extra plate for towing still requires document checks. A registered supplier must check identity and entitlement to use the registration. For a plate repeating your towing vehicle’s registration, prepare documents relating to that vehicle, such as its V5C, together with suitable identification. Check the GOV.UK list of accepted documents before ordering.
Taking a trailer abroad
Some trailers need separate registration for international travel. Where this applies, the trailer’s own registration plate is displayed in addition to the towing vehicle’s plate. It does not replace the matching vehicle plate. Check the official rules for your trailer and destination before travelling.
A quick check before every journey
- Compare the trailer plate with the towing vehicle’s current registration.
- Check that the plate is secure, clean, readable and unobstructed.
- Check the trailer lights and number plate illumination.
- Complete the remaining towing safety checks, including coupling, tyres, load security and applicable weight limits.
Need a matching trailer number plate?
Check your registration and mounting space, then order a standard yellow rear number plate from Number Plate Supply. Choose the rear plate option for your trailer and enter the registration of the vehicle that will tow it.
Guidance checked against GOV.UK on 20 October 2026. This article focuses on ordinary UK towing; specialist and international requirements may differ.
