My opinion only, but I wouldn't say that renting a motorhome saves you money. We rented a 30 ft. Class A motorhome a few years ago and took a 2 week trip through Colorado, Utah, Arizona and New Mexico. While it is a vacation that none of us will ever forget, it was not cheap.
There are some hidden costs in renting a motorhome - mileage over what's allowed, generator use over what's allowed, additional toll charges, 'convenience kits' (usually blankets etc.), 'kitchen kits' (utensils, etc. for everyone), cleaning fee and insurance (our auto insurance didn't cover renting a motorhome so had to buy it independently). You'll also have to put down a security deposit. We hit a terrible hail storm in New Mexico that cracked one of the plastic vents...which wasn't covered by insurance...not expensive but additional $$
I did most of the driving. It was not difficult, but it is different. Depending on the length of the vehicle, you have to make wider turns...be careful not to bottom out...and you don't have a rearview window that the driver can see out of. Driving over the Rockies in an RV was very slow going. The worst part we experienced was that we didn't have another car. If we wanted to go out of the campground, we had to unhook all the utilities, make sure everything inside was secured, and away we went in this RV.
Like I said, we loved the experience...and I think everyone should do it at least once, but we did not save any money by renting the RV. A few years after this trip, we rented family cabins at the KOAs near the places we wanted to visit (WY and SD) and brought our camping gear/stove so we could still cook our own food.
Good luck, and whatever you decide - have a wonderful time!!