Suprz,
You have gotten a lot of great and accurate responses, but as far as shift driving, you will find that it is difficult to rest in any MH that is underway. What you have to remember about a Class C is that it is really a cabin, plopped onto a truck or bus chassis. The ride is very much like a schoolbus. Ever ride in the back of a schoolbus?
We have a very gentle old Class A and one of us can sleep underway, and an 1100 mile day is still a real stretch and very wearing. Our realistic limit is about 550 miles (just like trucks) and that is with two drivers and at least one navigator. If you want to do more, I suggest that you lease a coach as close to what you plan to buy and do a few short runs like Providence to Bangor on Rt-202 (No blue roads allowed) or to Buffalo any way you want (the tolls will be a killer for that run). If you do either of those in a weekend, you will have a much better idea of what you are setting yourself up for.
Other idea, lease the RV for three weeks but pick it up near one of wanted locations. Drive the big circle, give it back and fly home.
My favorite quote these days is from Charles Kuralt — "Thanks to the Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything."
Safe Travel however you do it.
Matt