I doubt this is the problem but maybe worth a check. The springs have two sets of mounting holes (to adjust the trailer up/down about an inch) for height adjustment. I would make sure all springs are using the same sets of holes. Other than that, I'm with Ron, maybe a soft/torn spring or an incorrect higher load rating spring installed in one position.
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2007 MS 36 TK3, Demco Glide Ride
2012 GMC 3500HD D/A CC, AirSafe Hitch
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