I was last night looking to see what it might cost to rent an RV to "just see" and the rental costs on most of the sites for say a month came close to what used ones go for. If I was going to rent a couple times to see if it was for me, I could very likely just buy one used. Yes, I'd have to look it over etc and such, but this same sort of thing got me to buy an old loader years ago to reflatten our driveway as the service fees over and above the gravel were like $1,800 back then, and the loader was $3,000. I re-did the driveway 4 times so far and I'm ahead lol.
Of course, I am pretty skeptical about RVing in general working well for me, but I just had to point out the rental rates were so high that I stepped away from "trying it out" for now.