A number plate for a trailer is a rear registration plate fitted to a trailer or caravan, and in most cases it shows the registration of the vehicle towing it, not a separate number of its own. It must meet the same British Standard as a car plate: reflective, in the legal font, yellow with black characters, made by a registered number plate supplier. Some heavier or specially categorised trailers have their own registration, so the exact rule depends on the type.
Part of Personalised Number Plates. Start with the main guide: Cherished Plates: What They Are and How They Work
Updated October 2026 · Independent information, not legal advice
The common trouble comes from towing situations that change often: a new tow car, a borrowed trailer, a plate lost on a motorway or a bike rack that hides the car's plate. Here is which plate goes where, how to get it made, what to do when you swap tow vehicles and what to check on GOV.UK.
Does A Trailer Need A Number Plate?
The short version of the number plate for trailer rules is that a plate is normally required. A trailer towed on a public road normally needs a rear number plate showing the registration of the towing vehicle, unless the trailer has its own registration under the rules for its type. The exact requirement depends on the trailer, so check GOV.UK for the current wording.
Why trailers carry a plate at all
A trailer's lights and rear view often block or replace the tow vehicle's plate. A trailer plate keeps the registration readable for cameras, police and other road users.
Which trailers carry their own registration
Some heavier trailers and special types may have separate registration. Read the rules for your trailer type on GOV.UK, and see commercial vehicle tax for the commercial side.
What Registration Goes On A Trailer Plate?
The plate on a trailer normally shows the registration of the vehicle that tows it at that moment. If the tow vehicle changes, the trailer plate needs to change too, unless the trailer has its own registration.
- Use the tow vehicle's registration for an unregistered trailer.
- Use the trailer's own registration if it has one.
- Replace the plate if the tow vehicle changes.
- Do not leave an out-of-date plate fitted.
What Should Registration Plates For Trailers Look Like?
Registration plates for trailers follow the same standard as other rear plates: yellow reflective background, black characters in the legal font, supplier details on the plate. The plate must be in good condition and clearly visible.
| Trailer type | Whose registration? | What to check |
|---|---|---|
| Light trailer | Tow vehicle's number | Plate must change with the tow vehicle |
| Caravan | Tow vehicle's number | Rear plate fitted correctly |
| Heavier trailer | May have its own | Check GOV.UK for your type |
| Horsebox or livestock trailer | Depends on type | Rules vary by weight and use |
| Boat or utility trailer | Tow vehicle's number | Plate must stay visible |
Do Caravans Need A Number Plate?
A caravan number plate is a rear plate showing the towing vehicle's registration, in the same yellow reflective format. Caravans are towed vehicles, so the plate normally follows the car pulling them. Motor caravans, which are self-propelled, are different: they carry their own registration front and rear.
Caravan reg plates
Caravan reg plates are made like any other plate by a registered supplier. The caravan's chassis number or other identifiers are separate from the plate.
Motorhomes
Motorhomes are registered vehicles with their own plates. See motor caravan road tax.
Who Can Make A Trailer Plate?
Only a registered number plate supplier may make road plates, including trailer plates. Expect to show identity and proof that you are entitled to display the registration. See legal number plates in the UK.
- Confirm whose registration the plate will show.
- Choose a registered supplier.
- Provide identity and entitlement, such as a V5C.
- Order the yellow rear plate.
- Fit it securely and keep it visible.
What Proof Does A Supplier Want?
For a tow vehicle's number the supplier normally asks for the V5C for the vehicle. For a trailer with its own registration, they ask for evidence of that. A V750 or V778 may apply for a personalised number.
Can I Use The Car's Own Rear Plate On The Trailer?
You must not move the car's plate onto the trailer and leave the car without one. The car still needs its own plates. A trailer plate is a separate plate showing the same registration.
Two plates, one number
Having a duplicate plate for the trailer is standard practice when the plate is made by a registered supplier.
Do not swap plates
Swapping the plate between car and trailer risks an offence on one of them.
How Do I Fit A Trailer Plate?
Fit it at the rear, squarely, where it is visible and, where required, illuminated at night. Check GOV.UK for the current requirements on lighting and position.
- Mount it flat and secure.
- Make sure nothing covers it.
- Check the rear plate lamp works.
- Keep the plate clean.
- Check it before each journey.
What If The Trailer Plate Hides Behind Equipment?
A tow bar, bike rack or cargo carrier may hide the tow car's plate. The rules for a second plate on the rack or trailer need checking on GOV.UK. See rear number plate.
Bike and cycle racks
A rack that blocks the rear plate often needs its own legal plate fixed to it.
Cargo boxes
Anything that hides the plate must be arranged so a legal plate is visible.
What If I Change My Tow Vehicle?
If you change tow vehicle, the trailer plate must show the new vehicle's registration if the trailer has no registration of its own. Order a new plate and remove the old one.
Borrowed trailers
If you borrow a trailer, the plate on it may show someone else's registration. You may need your own plate. Check GOV.UK before towing.
Hired trailers
Hire companies often have their own arrangements. Ask how the plate is handled.
What About Vehicle Tax And Insurance?
A trailer does not normally pay vehicle tax in the same way as a car, and the tow vehicle's tax and insurance still apply. Check GOV.UK for current rules, and see vehicle excise duty for how tax works.
Do Trailers Need An MOT?
Most light trailers do not have an MOT, though heavier or commercial trailers may have a different test regime. Check GOV.UK for your trailer type. See what fails an MOT for the car side.
Do Personalised Plates Affect Trailer Plates?
If your tow car has a personalised number plate, the trailer plate shows that registration. If you later move the personalised number to another car, change the trailer plate. See personalised number plates.
Retained numbers
If a number is retained off the tow vehicle, the trailer plate must change.
Dateless numbers
A dateless plate on the tow car appears on the trailer in the same way.
What Are The Rules In Northern Ireland And Ireland?
Northern Ireland has its own plate formats and the DVA runs testing, while registration remains with the DVLA. In the Republic of Ireland the plates follow a different system. See Driver and Vehicle Agency and Irish number plates.
What About Towing Abroad?
Towing abroad has extra requirements that depend on the destination. Check GOV.UK for current guidance on registration, plates and identifiers before travelling.
What Happens If A Trailer Plate Is Wrong Or Missing?
A wrong or missing plate can lead to a fine, an MOT problem for the tow vehicle where relevant and trouble at borders. Penalties depend on the offence. See GOV.UK for the current position.
How Do I Check The Vehicle Behind A Registration?
The free number plate check shows the make, model and MOT and tax details recorded against a registration. It does not show a trailer's own history unless it has a registration.
Which Towing Scenarios Cause The Most Plate Problems?
Plate errors tend to come from a handful of everyday situations. Knowing them in advance saves a roadside stop.
Borrowing a trailer from a friend
The plate on a borrowed trailer shows the owner's tow vehicle, not yours. Fit a plate showing your tow vehicle's registration before towing, and put the owner's back when you return it.
Buying a second-hand trailer
A used trailer may come with a plate for the previous owner's car. Replace it with a plate for your tow vehicle, and keep the old plate out of use.
Towing with a hire car or van
A hired tow vehicle has its own registration. The trailer plate must match it for the period of hire, so ask the hire company how it handles trailer plates.
Switching between two family cars
A trailer used behind two cars needs a plate showing whichever one is towing. Changing a plate each time is awkward, so check whether the rules allow another approach for your trailer type.
- Always match the plate to the tow vehicle in use.
- Never leave an old registration on view.
- Check both plates before every trip.
- Keep spare fixings for quick changes.
How Do I Choose Where To Buy A Trailer Plate?
Choose a registered supplier, check the plate details when it arrives and keep the receipt.
Questions to ask a supplier
- Are you a registered number plate supplier?
- What identity and proof do you need?
- Is the plate reflective and yellow?
- Will the supplier name appear on the plate?
- How long will the order take?
Plates for trailers with their own registration
If the trailer has its own registration, the supplier will ask for evidence such as the registration document for it, not the tow vehicle's V5C.
What Lights And Reflectors Go With The Plate?
The plate sits alongside rear lights, reflectors and a plate lamp. The rules on lighting depend on the trailer and the date it was built, so check GOV.UK. A plate that cannot be seen at night because the lamp has failed is a common fault.
Plate lamp
Where required, the rear plate must be lit so it can be read in the dark. Check that the lamp works before every journey.
Rear lights
Failed lights are among the most common roadside problems on trailers. Test them with the tow vehicle's lights on.
- Check indicators.
- Check brake lights.
- Check the plate lamp.
- Check the electrical connector.
What Are The Plate Rules For Horseboxes, Boat Trailers And Livestock Trailers?
Horseboxes, boat trailers and livestock trailers are trailers like any other, but weight and use may bring extra rules, such as registration for heavier trailers. See commercial vehicle tax and GOV.UK.
Boat trailers
A boat trailer plate must stay visible even if the boat hangs over the rear. A boat that hides the plate means the plate needs relocating.
Horseboxes
Check the rules for the weight category of your trailer, which can include its own registration.
How Do I Keep A Trailer Plate Legal Over Time?
A plate wears faster on a trailer because it sits low and takes spray, stones and mud. Look after it, and replace it before it becomes illegible.
- Wash it when you wash the trailer.
- Check it for cracks and fading.
- Replace it if the characters fade.
- Refit fixings that have come loose.
- Keep a note of which registration it shows.
What If My Trailer Plate Is Stolen?
Plate theft is common because plates can be used on other vehicles. Report it to the police, order a replacement and, if your registration is misused, tell the DVLA. See number plate flipper and track a number plate for related issues.
Common Mistakes With Trailer Plates
- Forgetting to change the plate when the tow vehicle changes.
- Using a plate that is not reflective.
- Using stickers or paint to make a plate.
- Letting a rack or box hide the plate.
- Fitting a plate that looks right but was not made by a registered supplier.
- Forgetting that a rack or box can hide the plate.
- Leaving a failed plate lamp unrepaired.
- Towing with an old plate from a previous owner.
Myths About Trailer Plates
Myth: a trailer never needs a plate. Most towed trailers do.
Myth: any yellow plate will do. It must be a legal plate from a registered supplier.
Myth: you can write the number on the trailer. Painted or handwritten plates are not legal.
Where To Check The Official Position
GOV.UK and the DVLA set out the plate rules for each trailer type. Read number plates for motorbikes for another case where plates differ.
How do trailer plates relate to other plate terms?
A trailer plate repeats the registration of the towing vehicle, so a private plate or cherished number plate on the car must be matched on the trailer. A current style registration has an age identifier between the two area letters and the three random letters, while a prefix or suffix registration places a year letter at the start or end; the trailer plate shows whatever the towing vehicle carries. Plates are normally made to BS AU 145e, and a show plate is for display only and not for road use. If a cherished number has been taken off a vehicle, the V778 retention document shows it is held and it cannot be shown on the road until reassigned. The V317 is the DVLA route for transfer or retention applications, and plate lettering uses the Charles Wright typeface style.
Frequently Asked Questions
Does my trailer need a number plate?
Usually yes. A towed trailer normally carries a rear plate showing the towing vehicle's registration, unless it has its own registration under the rules for its type. Check GOV.UK for the requirements for your particular trailer, because they depend on weight and use.
What number plate for a trailer should I use?
Normally the registration of the vehicle towing it at the time, unless the trailer has its own registration. If you change tow vehicle, the trailer plate needs to change too. A registered supplier can make the correct plate when you show the V5C for the tow vehicle.
Can I get registration plates for trailers made online?
Yes, from a registered number plate supplier. They should ask for proof of identity and entitlement to the registration, then make a yellow reflective plate to the British Standard. Be cautious of sellers that make plates without any checks.
Does a caravan number plate match my car?
Normally, yes. A caravan number plate shows the registration of the car pulling it, in the same yellow reflective rear format. If you tow with a different vehicle, you should change the plate, unless the caravan has its own registration under the rules for its type.
What are caravan reg plates made of?
They are made like other rear plates, with reflective yellow sheeting and black characters in the legal font on a backing plate. A registered supplier produces them to the standard. Do not use stickers, paint or handwritten plates, which are not legal.
Can I move my car's rear plate to the trailer?
You should not, because the car still needs its own plates. A trailer plate is a separate plate showing the same registration. Ask a registered supplier for a plate for the trailer and keep the car's plate on the car.
What if a bike rack hides my plate?
A rack that hides the plate may require a legal plate on the rack or trailer. The rules on a second plate and lighting are set out on GOV.UK, so check the current wording before travelling. Do not leave the registration unreadable.
Do motorhomes need a trailer plate?
A motorhome is a self-propelled vehicle with its own registration, so it carries its own front and rear plates. If it tows a trailer or car, the trailer plate follows the towing rules. Check GOV.UK for the current guidance.
Is a trailer plate the same as a personalised plate?
Not by itself. A trailer plate shows the tow vehicle's registration. If that registration is a personalised one, the trailer plate will show it too. If you move the personalised number to another vehicle, the trailer plate should be changed.
What happens if my trailer plate is missing?
You may be fined and could have problems at roadside checks or when travelling. Replace the plate as soon as possible through a registered supplier and report a stolen plate to the police. See GOV.UK for current penalties.
Official Sources
Rules, fees and deadlines change. Confirm anything that affects your money or legal position with the official service.