I have a 2012 2500 HD Cummins Diesel GMC and tow a 10,000 lb bumper pull. I have added two leaf springs on each side of truck. What can I do to improve the bumpy ride while towing the trailer?
Sounds as if you were trying to mitigate sag by adding an extra set of leafs and created a stiffer ride.
With only a 1200# tounge "roughly", a properly setup WDH with properly rated trunnion bars would transfer some weight to the front axle and take the sag out of the rear.
I'd remove the added leafs and put my money on a reputable WDH before any other alterations.
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