"As far as I am aware a trailer being towed by a French registered
vehicle where the trailer weight is up to 750kg the trailer carried the
vehicle registration. Over 750kg the trailer requires separate
As has been pointed out, a trailer being towed by a French registered vehicle does not require separate registration up to 500kg gross laden weight and carries the registration number of the towing vehicle. Over 500kg it requires separate registration and its own number.
A trailer up to 750kg gross does not require to be braked. Over 750kg gross the trailer is required to have its own braking system.