Help!- Trying to rent a car at airport to pick upRV

I like the idea of having the owner pick you up (you could offer to split the gas money). My thought is that it gives you an opportunity to learn more about him and his RV usage. A casual comment about the "camping opportunities in the Phoenix area" and you might find out he only takes it to visit the grandkids in Colorado or something. Keep it casual and non-pressure and he might provide info he wouldn't have otherwise.