Most ordinary car and caravan trailers don't need an MOT. Annual testing applies to larger and commercial trailers - broadly HGV trailers and heavier goods trailers over 3,500kg gross weight. Whatever the size, though, the trailer and the vehicle towing it must always be roadworthy and safe.
Which trailers need an MOT?
Everyday light trailers - box trailers, small plant trailers, caravans and horse trailers towed by cars - are not subject to the annual MOT. Testing applies mainly to:
- goods trailers over 3,500kg gross vehicle weight, and
- trailers used commercially with HGVs.
These heavier trailers are tested annually (the trailer has its own test and identification number). If you tow a normal trailer behind a car, an MOT almost certainly doesn't apply to it.
Roadworthy still matters - MOT or not
No MOT requirement is not the same as no rules. Any trailer on the road must be in a safe, roadworthy condition. The driver is responsible, and defects can lead to fines and penalty points. Before towing, check:
- Tyres - tread, pressure, age and condition (trailer tyres often perish before they wear out)
- Lights - all indicators, brake and side lights working via the connector
- Brakes - on braked trailers, that they engage and the breakaway cable is intact
- Coupling and hitch - secure, not worn, correctly latched
- Load - within the trailer's limit and secured
Towing weight and your licence
What you can legally tow depends on your driving licence and the combined weight of vehicle plus trailer. Rules changed in late 2021, so most licence holders can now tow heavier combinations than before - but always check your own entitlement and the vehicle's towing limits.
Check the tow car's MOT
The car doing the towing still needs a valid MOT and tax. You can confirm both free on RegScan - enter the registration to see MOT status, history and tax in one place. Check the vehicle.
Frequently Asked Questions
Does a trailer need an MOT?
Most ordinary car trailers and caravans don't. Annual testing mainly applies to goods trailers over 3,500kg and HGV trailers used commercially.
Do I need an MOT for a small box trailer or caravan?
No. Light trailers and caravans towed by cars aren't subject to the MOT, but they must still be roadworthy.
What weight of trailer needs testing?
Broadly, goods trailers over 3,500kg gross weight and HGV trailers require annual testing.
Can I be fined for an unsafe trailer even without an MOT?
Yes. A defective or unsafe trailer can bring fines and penalty points regardless of whether an MOT applies - the driver is responsible.
Does my tow car need a valid MOT?
Yes. The towing vehicle needs a valid MOT and tax. Check both free on RegScan with the registration.