I did a quick lookup and you appear to have a pin weight of over 2300 lbs what is the cargo capacity of your truck (sticker inside of drivers door.) if you are at or over the max for your truck it could be contributing to your problems. I pull a Silverback 37MBH 42' long 16,000 lbs gross and a pin weight of close to 2500 lbs. my TV is a Silverado 3500HD Duramax 4x4 Dully crewcab. Stock pinbox and curt Q20 hitch. I due get some chucking on big potholes but overall I dont even know the 5th wheel is back there. My wife calls it our cowboy Cadillac.
