I put off-the-shelf Bilsteins on the Ram. They were transformative. It rides better unloaded than my old Chevy 2500 did with the trailer hooked up. I don't remember how much they were but I want to say on the order of $400. Sam actually had the cheapest pricing when shipping was included.
My experience with stiffer sway bars has been that they degrade the ride of pretty much every vehicle.
I was about to pull the trigger on the Sulastic shackles for the Chevy, but decided to replace the whole truck instead
