A lot of the maintenance cost depends on your ability to do not only mechanical repairs, but also home repairs. Winterizing will cost anywhere from $100-200, it you have to have it done. An oil change will cost between $45 and $100+, depending on your setup. That doesn't include the generator, that's another $40-75.
For a comparison, I changed the oil in both the engine and the generator and winterized mine this weekend. I spent probably four hours total time (I was in no rush) and materials cost me less than $50, but more importantly I know it's done right.
For a $75k budget, you can get one heck of a set-up in either a Class A, or travel trailer and a truck to pull it. But if you are planning driving shorter trips and staying in one place for longer stays, I would agree with other suggestions that a travel trailer and truck might be a better way to go.
Doug
