This is very rewarding in so many ways loading my sleds for the first time in a enclosed trailer that I finished inside to fit my needs as a snowmobiler after towing on a open trailer for 22 years. This model, by ProLine, came in a 7.5 x 16 and 7 x 16. The 7.5 would have a bump out inside which would be part of the wheel well. I did not want that, but a straight flat wall and the ability to see around the trailer with-out tow mirrors. Its snug for two 137" track sleds but I can still move around inside with ease. I need to add a rack somwhere to hold my LinQ Seat back when not being used.