Picked up a used (abused) 18' enclosed trailer to haul FSAE cars with. It has a lot of damage from hauling unsecured loads inside the trailer. I spent several weekends fixing the lights, paneling, jack, side door, rear door, sealing leaks, replaced a side vent and painting the floor. I also built ramps for getting the cars in and out without high-siding. Overall it turned out pretty good.
The trailer is about 3 inches too short from fitting the cars perfectly. One car needs to be offset so the rear tires miss the other car as you can see from the last picture.