I don't have personal experiance but my old neighbor did one.
First off, if it is too bad you need to strip out the entire interior cause just like a house mold gets in insulatin, carpet, ect, and then the slightest moisture (common here) brings it all back. Kinda spendy to replace it all. Like $500-$1000 minimum.
Not so bad? To replace interior panels you still need to strip it cause you can't get to everything.
Think replacing drywall in bathroom. You need to remove cabnts, shower stall....
Lotta work. And your deling with thin wood, sometimes on aluminum frames. Not like a home repair. Need a few special tools and hardware.
The outside is a pain. He does aluminum siding and still had problems. He finally just resided the entire thing......
Like I said, he is a contractor, has all the tools, remnants and skills....still had problems.
Personal feelings: if you think your going to gt into this as a business or you want an RV for yourself at a cheaper price? Go for it.
One time deal to flip? Not worth it. Just like flipping houses or cars. The first ones are the most work and costly cause you don't have the skill set or tools.
That said, if its blue booked at $10k and goes for a grand......might reconsider my point of view.
Watch some youtube videos.....there's a lot.
This guy got an estimate of $4300 for repairs and did it for $500 in 70 hours. Tho he does mention it took a LOT of tools! lol