My low-buck solution was to buy a hitch hauler from Harbor Freight ($32 on sale) that is rated for 500lbs. I bought 2 6ft lengths of 1.5" wide angle iron at Home Depot ($8 each) and welded up a frame that I bolted to the hitch hauler. I bought 2 more 1" angles and welded up a loading ramp. Painted the whole thing with Hammertite and went riding. I'm driving a '89 Bronco and hauling a '82 YZ250. The bike clears the rear spare tire and there is room on the hitch hauler for a gas can.