That seems to be the one design flaw with the system having a single hinge on the bumper. What about a dual hinge version that actually attaches to the truck body, or a custom bumper with a welded vertical pipe that could have the rack attached with two hinges? Seems like that would be more stable with less chance of fatigue. Although blocking the tailgate or the rear lights could be an issue.

96 T100 4x4 - 35's, 4" SL, 2" BL, 4.88s, ARBs, custom bumper & E9000 winch, etc.
99 F-350 4x4 superduty supercab turbodiesel longbed