If you have some pictures it would be great to see what it looks like.
built my own enclosed sled trailer last year. Was going to buy one but they wanted $9grand. So decided to build our own. Quite the learning experience. All in all it probably cost me just as much but mine is nicer than the one we were going to buy. We put a receiver hitch inside standing up so we can slide a winch in incase of break downs no more back breaking lifting/pulling. Also put a cargo box over the two axles with access from inside for tool storage. We are going to put a full size decal on both sides of the trailer later this year when not to busy.