I was looking for a 4" lift progressive rate coil to swap out the RCX coils that came with their 6" lift. I called Top Gun Customz and they don't even make the 2" lift progressive rate coils anymore. They referred me to a shop out in California called Valley Spring Works. I ordered a custom set of progressive rate springs from them and am very satisfied. I've had the custom coils on my truck for several months now and they ride better than the RCX coils and do not squat near as bad when towing my trailer. The owner's name is Bill. Call him up and he can make them as still or soft as you want. If memory serves me correct, the rear coils cost me less than $300 shipped.