You probably didn't even know there was such a thing as an RV resort, huh. Well, my buddies and I took a road trip in an RV to Burning Man (yeah yeah I know) and we stopped off in Vegas.
Anyway, RV Resorts are kinda what they sound like: places to park your RV for a few days, but there are facilities too. Usually there's a park and a pool and sometimes a restaurant or grocery store. We stayed at the Oasis RV Resort and they have a lazy river. We didn't use the pools though.
You have to understand what seedy places these resorts can be in a place like Vegas. There are a lot of transients. Think about it - you can get a cheap motel for nothing here...
... but you're staying in an RV Resort? You're either down and out, living in Vegas in your RV because parking sucks there, or you have some tricked-out luxury RV you just love.