i have a 5x8 (hardware store 600 bucks)fits two extended gsxr100's just fine dually ATV's though i could see be a stretch though it may work there's not too much room between the bikes when their on there also it tiny in comparision to the hummer and i cant hardly see it in the mirrors when towing though the rearview cam helps with that
mine is hopefully getting a lift wheels and tires to match the truck as well (man i spend too much money on stupid stuff) oh well what do you do