The bumper and trailer body might flex a bit, which is normal. But the bumper should not move seperately from the aluminum skin.
You watch while a second person bounces on the bumper. If you see the bumper move seperately from the aluminum skin just above the bumper, there is a problem.
Even if you do the bounce test, and do not see seperation, that will not be a guarantee that the frame is not rusted. The ONLY way is to look inside.
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Alan
2014 Silverado LTZ 1500 Crew Cab 5.3L maximum trailering package
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