I am using the GPF frame tie-ins, and though I haven't towed much behind it, I have run a heavy load on the tire carrier for a couple years and wheel it that way, bouncing a good bit. Hasn't budged. If anything, just jack up the bumper and tighten bolts, then tack the tie-ins to the frame? I can't recall if tie-ins are standard or if I got them from Eddie separately. Eddie?
80 CJ7_360_32RH_D300_44/9"(4.56)_custom bumpers/cage
4" lift,tube fenders,comp cut_37s on H1 rims