My dad went back to a 99 ish Sea Breeze with the V10 Triton. He pulls a Wrangler Unlimited that he uses off road (pretty heavy).
The motorhome still goes over the passes, but it is SLOW. That vintage Triton just doesn't have a ton of power, but it does get the job done.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010