Depends on A your licence, B weight of trailer. Some of the trailers under 750kg mass don't have to have brakes, so a secondary attachment is very wise. If you have a trailer entitlement, override braked trailers now most have a secondary cable from brakes attached. Ensure it is good condition and the link is sound. I have room to strap around the tow hitch on mine as my trailers are eyes. If you have a period trailer it can become a bit more fraught, though the hitches them selves being eye rings have a positive lock over the eye. Do make sure that if you have a fixed hook the pintle on the trailer can rotate, and vicea versus. The Standard MW was a fixed hook, so must have a rotating pintle trailer. 50 mm ball hitches have built in rotation to the hitch were required. Do you have a specific trailer in mind and what sort of hitch does it have?