Which ever way you end up doing it, an important part is eliminating bounce. The actual weight isn't that great but the bouncing will end up cracking metal and welds. I used a stainless steel loop with ss bolts and lock nuts that go through the rear wall and through a wall stud. I was able to access the inside behind a cupboard to install washers and a lock nut. I use bungee cords to hold the bikes toward the rig. On the other end of the bikes I bungee to the ladder. Again, it takes the bounce out of it. They dont need to be sucked tight to the rig, just enough to not let them "whip" or bounce.
Just an exampleLooking at the picture again. imagine the slop that occurs when you place the bike rack into the receiver. When you are all done lift up on the bikes and receiver and you will see how much slop there is and this is what will happen as you hit bumps. It's amplified the further away from the axle and the longer the trailer is.
