Did your truck bottom out during your trip?
There are a couple of top-of-leaf solutions which would help.
SuperSprings:
https://www.supersprings.com/shop/ssa28/
Roadmaster Active Suspension:
https://activesuspension.com/
I had the SuperSprings for my Gen 1, but I am looking at the Roadmaster solution for my Gen 2.
Oddly enough no bottoming out, and I must of been around 500 lbs above the payload rating and was on some really rough roads.
I am interested in solutions that would improve the handling when towing, although it didn't bottom out it was far from perfect. Just performed well above my expectations.
Do any of the solutions you recommended above have an impact the truck's off-road ability?