I also have Rancho adjustable on my W350, always on max with the Lance TC, but have moved to a 25ft TT and moved them to the min setting for a more tollerable ride.
You may just need to try it one way then adjust and try again for your own results.
1993 Dodge W350 Cummins with all the goodies
2014 Ram 1500 Laramie Longhorn 2wd 395hp
2017 Forest River Surveyor 243 RBS
2001 Super Sherpa & 2012 DL650A go along also