We are currently making the back of my parents trailer to pull doubles. We took the old bumper and out riggers off. We are replacing them with 3/16" 2x3" tubing. Each tube will be about 6' long welded to the frame of the trailer. The weight of these dirt bikes will be about as much tongue weight we will have. You don't want to put a 400lb bike back there with just a tilt rack. There will be a lot of bouncing and stress put on the metal just from that alone. We notice the metal used on my parents reach was barely hair thin. It only had a 200lb capacity cargo capicity. The rack may be rated to hold the bike, but the support holding the rack may not. JMO.