Buy a 2500 or 3500, run the tires a factory spec 80/65psi. Keep your 1500, after driving the 2500 jump in your 1500 you'll realize your 1500 DOES ride like a Caddy! :D
Seriously though. What tires and what's your psi. Also, not sure if it will help on the 1500 but on my 2500 RegCab Long bed I...