Sprinter guy here. 1st - the cab/chassis units that B+/C rigs are built on do, in fact, have a frame, not a unibody. Moved to the MB after 100k on a Chevy Express 3500. Sprinter climbs hills just as well as my big old V8 did. We also tow 3300# of toad with it. I have never tried to climb hills in either rig with engine screaming - not afraid to slow down on long climbs. Still pass semi's going uphill. Got 15 mpg in the Chevy. Get 15+ mpg in the Sprinter while towing. Liked my Chevy. Like my Sprinter. Used to change oil in Chevy about twice a year, maybe 3 times. About $50 a pop. Do annual oil change in Sprinter, since they say good for 20k. Cost $140. So break even there. didn't have any major issues with the Chevy, so far none with MB, so can't compare. Familiar with Ford Super-Duties - drive F450 almost every day. Have had more issues with that truck/suspension/transmission than either of my rigs. So wasn't interested in going down that road. All said, get what feels right for you! ST
