Is buying an RV lot a good investment?

NWRV, although those resorts are very nice another option is to just buy land and put your own hookups on it and use it like you would this resort. Just make sure you check local laws on the legality before doing this. It's not legal in most places in California, but there are some counties who allow it. I own 20 acres of land in a County that doesn't allow it, but I camp on my land all the time in my RV and never had an issue. My neighbor up there lived in his 5th wheel for 5 years before eventually building a house.