I think the swivelwheel 58DW with the 6' extension will be my best bet. Price really isn't to bad. Plus is isn't considered a trailer, but an extension of the camper. It will have lights as well which are required for anything 48" past the end of your rig anyway. only problem is my cart is electric. I dont know the exact weight but its more than a gas, which these swivel wheels are designed for. Maybe I can get higher ply tires and beef up the steel if needed.