I have a similar setup as Hardscrabble and have the same opinion on the upgrades on my GMC 2500 & Wolf Creek 850. Lower StableLoads (single best thing I did for leveling ride and sway), HD Timbren's (I added these for those times I haul a trailer), Bilstein 4600 (big improvement over stock GM shocks), and just two years ago added a Big Wig sway bar for the crosswinds here in my new home state of Idaho.
We are planning a 5,500-mile trip this summer to visit family and friends after years of living in Alaska and not being able to just head over for a visit. This will be the 10th summer with our camper and our first multi-month trip adventuring across a dozen states.