We used
Alamo last May through priceline and got a great rate, I hope you did also. We had no problems at all. Everything went smoothly. If you are not getting the damage waiver you may want to bring a copy of your insurance card. They asked m for it ( I didn't have it). It apparently wasn't necessary as i was able to rent without getting the additional insurance.
Also when you drop off at the airport. We found it easier to drive to the terminal drop off the luggage with the sky cap, leave the wife and kids, return the car by myself and catch up to them at a predetermined spot. This made it easier than having to load the luggage onto the bus and from the bus to the curb.
Good luck and have a great trip.