I've had a similar setup with a level on top of the hitch pin tucked close to the nose cap on 2 different fivers ... mine also moved about 1/4" also depending on road conditions. Other than initially catching my attention, I had no troubles. I'm trying to remember back in my physics days about load arms and effort arms related to deflection, but I think I've slept since then more than a time or two ... Ha! On a more serious note ... others have had frame problems of a much greater magnitude as in actually seeing bedroom cabinetry move when hitching and unhitching.
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