Do you have a weight distributing hitch with sway control? Works like a charm. Also I have 10 ply rated tires which is a LT tire not a P. BTW, I towed bigger campers with a 1500 and I never had a sway problem with the correct tires and weight dist/sway control hitch. My 2500 has a rear tire pressure rating of 45 lbs empty and 70 lbs when loaded and towing.