Is the thread you were talking about.
Many folks attach stuff to the Ultralite bumper and frame system.
Many folks have never had a problem.
Many folks are shocked to find out they have invalidated their frame warranty and their RV insurance when they alter the camper's frame.
I learned this the hard way when I had a VERY light bike rack (the kind that goes around the spare tire but attaches to the frame) with two small lightweight bikes on it. I could not keep the bumper caps on the bumper. Everytime I stopped for gas the caps were about to fall out. Just that little flex from the bikes moving was enough to twist the square bumper enough to work out the caps.
I called FR about a frame hitch that was welded/bolted to the frame and was told in no uncertain terms that the FRAME of the Ultra-lite was incapable of handling the torsion without cracking over time. The metal web of the I-beam was just too thin and the "arm" (torque) was too long.
I carry the bikes on our truck with a nose hitch now.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW