I have rented several times.
Once from Cruise America.
Once from El Monte RV.
But the best was the $100 per day, no mileage fee MBZ turbo diesel Sprinter I rented off of CL. That, was a great experience! I got 18 mpg avg driving 70 mph around Death Valley and Las Vegas last December with my son.
It was a Winnebago conversion that slept 4 - 2 or three is just perfect!
Good luck. CL is your friend.