Welcome to the JOF, ribzz43. I may be able to shed a little light to your question regarding the rear bumper/bike rack issue. We have an X19H (a small hybrid) and last summer I did sime research as to what my options were for transporting bikes. I came across a bumper adapter that bolts to the rear bumper of any 4" square RV bumper, then your attachment plugs into that. It was designed for RV's and was supposed to be a good solution for us folks that didn't want anything permanent on our TT's, and could be used for bike racks, grills, etc. So I bought one, attached it to the bumper of the Jayco EXACTLY as the instructions read, put a 4-bike rack into it, put 3 bikes into the receiver and went camping. Upon arrival at the CG, I noticed that the bumper was "tilted." Not good!! Upon further review, the bumper had actually torn; the steel was tearing--the welds were holding up just fine. On the way home from the CG, the 3 bikes were inside the TT, and I was less than happy. I called the RV dealer that recommended this attachment, and they said it wasn't their problem. I called the manufacturer of the adapter (Swagman) and sent them pictures of the damage and a warranty claim form. The manager at Swagman told me--in writing--that that adapter is specifically NOT for Jayco's. Another call to the Jayco dealer where I bought the TT from and that recommended that adapter finally agreed to replace the bumper. While the TT was in the shop, they welded 2 more reinforcement beams from the bumper to the frame, and said that problem would never happen again, and that we will be able to use the adapter again. We haven't used it again since then, and it sure seems strong since they reinforced it. We'll see!! CW has the adapter that I'm referring to if you want to get a better idea of what I'm referring to. Bottom line: IMHO, don't attach a bike rack to the rear bumper of your TT unless you get work done to it first!! Hope this helps, and Happy Camping!!!