One of the coolest open trailers I have seen is the ones that have air ride and can lower. I pitted next to a guy with one and he had a key fob for it. When he got in the car he hit a button on the keyfob and the trailer laid on the ground, then when he pulled on it he hit the button and it raised back up. He said he hauled all kinds of vehicles and it was super nice not to have to mess with ramps. I am sure they cost $$$ though.