Question on Sprinter based motorhomes

DrewE wrote:
I have no way of answering your first question. Basic physics suggests it won't be a rocket ship going up grades.

From the specifications in the manual available from the Cummins/Onan website, the Onan QG3600LP (which I would assume this generator is) uses 1.5 lbs/hr under no load, 2.2 lbs/hr under half load, and 3.3 lbs/hr under full load. Propane generators use a lot of propane; getting a diesel generator, if possible, would definitely be preferable in my opinion as it uses less fuel (diesel fuel is more energy dense), the tank is bigger, and it's easier to find places to fill it up.

Good answer to Q#2.
The diesel generator is an absolute brute for it's size, and it shares the fuel tank with the chassis engine, and that works better than searching for propane for me. It also uses significantly less fuel at the same load levels as those posted for the propane generator. Also, don't worry about the smaller 26 gallon fuel tank, as the MB V6 3.0L turbo diesel uses less than half as much fuel as the Ford chassis with the 50 gallon tank, to cover the same ground. I average around 15 mpg not towing, and lose about 2 mpg towing the 4400 lb Wrangler (I run the Jeep's tank down to 1/4 full to lighten it) but there are always other factors that might affect those numbers. If you can find ways to lighten your Ranger, that will give you a little more towing capacity. When I tow, fully loaded for travel, I'm around 250 lbs below the GCWR, so yes, it's close, but it can be done.
Not towing, I have no problems climbing grades. Towing, I'm not going to win any races, but the Navion never struggles. I actually like descending less, because it doesn't have engine brakes, but if you know how to use the brakes and transmission together, it's not a problem, either.

btw, which motorhome are you looking at?