So glad I chose to rent a van from Escape Campervans when going on a roadtrip to Joshua Tree. The vans are comfortable and really include everything so I never felt like I needed anything when I was on the road and camping. Phoenix office just opened I believe so it's still quite small and you might have to wait a little to pick up/drop off, but everything about the process was smooth and helpful. You tour the van and its features before heading out, and have resources (ie. guidebook and phone contacts) if there are any issues on the road, which I appreciated especially as a solo traveler. Thanks!