My next door neighbors sold everything they owned, bought a huge RV, and became full timers. They come back to San Antonio for about two months every year. Every time they stay at the Blazing Star RV Resort. They like it a lot. I have visited them out there. It is not my kind of place (I like state parks), but it has all the amenities and is very well maintained. It is on the outermost loop (1604) with easy access to highways to get you wherever you want to go in the city. It is close to restaurants and any kind of store you want.
Blazing Star RV website