Originally Posted by Hans627
I'm trying to understand why adding a receiver hitch to the frame to carry a two bike rack would create a problem with the frame on the rear of the trailer. The two bike rack sold by AS, the Fiamma, attaches to the frame in the rear. While it is attached to the back of the AS for rigidity all the weight of the rack and the bikes is carried by the rear frame. Am I missing something?
The centre of mass of the bikes and rack is located above and behind the mounting point on the rear frame. As you travel down the road the bikes and rack can move around, applying a twisting force to the mounting point on the rear frame. That is what can lead to separation of the frame and shell in some cases. The additional small brace from the rack to the rear shell simply stops the bikes and rack from moving, so that the force applied to the rear bumper where the rack mounts is vertical.