Nothing at all, I made the reservation through this website and once I landed they rented the car to a customer ahead of me in line, their explanation when asked why this was done was that they dont go off of online reservations its first come first serve whether you have a reservation. As a result I had wait 2 hours to catch a ride with someone and was without a vehicle for the duration of my vacation and had to cancel so many of my plans due to not having a car. Also must add that they practically force you to add their insurance and say it's against their policy to not have their insurance. This was with the same for Alamo and Hertz at the airport of Durango Mexico
Respecting the reservation, and to not try to overcharge by changing reservation prices and lie and tell customers that you can not rent cars without their insurance.