I have MasterCraft Courser AXT tires and absolutely love them. Ride very well and the road manners are excellent. I'm running 60psi in all 4 corners right now as I'm towing very little if any. And even towing I only change the rears to 70. Very little difference then. Has the truck maybe had a helper spring or air bags added maybe? Tires should not be that bad. If your running the recommended pressures on the rear (which is probably 80psi) drop them if unloaded. Fronts could also be dropped to 60-65. I'm running the on truck in my sig for reference.