I agree about the diesel suggestion...the fuel economy for a gasser will be, um..."eye opening"...even with today's more efficient setups. It's a lot of work moving an RV around due to both the weight and the "aerodynamics of a brick".
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The most expensive tool is the one you buy "cheaply" and often...
I traveled the country and windsurfed for 10 years. I was single and slept in a van to keep costs down. I met a lot of windsurfers with small and large RV's.
In Texas we all admired a wealthy guy who had a new top of the line large RV until I got to talk with him. He was missing a lot of good windy days on the water. He told me had to go to the service center 50 miles away from our beach/campground to get his fridge fixed under warranty. Then his AC. Then his water heater.
He was an old farmer and knew a lot about fixing things, but it was under warranty. Just like John said an RV has all a house has or more and it vibrates and bounces around. All the stuff that needs service is in tight spaces.
Here's what I'd try Larry. Do 2 trial runs. Rent an RV for a week and take a trip. Then take a trip in your car and stay in motels. Make detailed notes on costs and hassles vs fun.
See what method offers the most freedom.
"Whether you think you can, or you think you can’t - you’re right."
- Henry Ford
Go into the world and do well. But more importantly, go into the world and do good.