In reading this thread, I find that I am very lucky.
Registration for the motorhome? No problem, paid for one year, then it became 11 years old, and eligible for PERMANENT registration. $253 or so, and I never have to renew it.
The only unexpected expense was replacing the slide awning, which was wind damaged in South Dakota. I just paid it instead of trying for insurance coverage. It wasn't worth the paperwork!
We went on a three thousand + mile trip last fall, and the awning was the only problem. It was great.
Yeah, reading about all the problems people have with their RVs, we are very lucky!