[Mike C]

To some degree, a 3/4 ton is just going to be rough. I would start by getting some adjustable shocks and playing with those as well as dropping your tire pressure. I'm sure max load is at least 50 psi if not 65 on your tires. Try running them around 35 when you aren't carrying a load, maybe less. The bigger the tire, the less psi it needs. Another option for the rear would be a Velvet Ride Shackle combined with your existing springs.