Chance I think a 5000lb axle could be in your future. Look's like your right on the money, it appears there's some flexing going on back there. Do you have a 2'' 3500lb axle ? 1600lb boat 400lb motor 400lb's of gas, 1000lb's of trailer or so; plus gear. I always think about those bumps in the road and the flexing going on back there.
Good Luck Bill
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