I have a 4'x6' with tonge tool box,bearing buddies,12" side rails,drop tail gate,new spoked rims with tires and spare,all new lights with wood 2x10 planks for floor. All 2" square tubing frame,2 1/2" thick wall tonge with diagonal supports,new fenders and 1" square tubing railing. I built it for the same reason you need but I need a bigger one. I don't have pictures but if you are interrested I could get them. I don't know what price range your looking in but if you are interrested let me know.