It sounds to me that by raising the front it shifted some of the weight from the hitch to the axles. With the hitch being lighter on the back axle of the truck (In My Opinion) it may be causing the bucking. If you eliminated the bed rails would you be able to adjust the hitch to a lower position and possibly shift some of the weight back to the front? My understanding is that the fifth wheel should be level when towing.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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