Well, on another forum (that for Barth motorhome owners - Barths are very upscale motorhomes built like Prevosts or Newells, only shorter; they're significantly heavier than plastic pigs of the same size), we've been comparing performance of Barths in the size range of mine (28' through 32', diesel pushers only). Most have Cummins 160, 190, 215, or (one with a 230) 5.9L. My humble Super-Rat (AMG 6.5L TD) apparently sucks the doors off the C-powered Barths, even the 230HP, but he's lugging 2K lbs more than I, and he's had a series of issues with the accessories.

Frankly, that surprised me; although the Cummins owners can put their feet into theirs all the way up the mountain, even watching EGT on mine (and I usually don't exceed 1050F), I can climb faster and easier.