First of all, you can always reserve a car online by going to their website at enterprise.com. The location of the business is pretty isolated, so you need a car to get there. If you don't (that's why you need to rent one), just call them and they will sometimes send some one to pick you up.
They have some new cars which are very nice but pricey too. They have very good customer service. Most of the front desks are Truman students or alumni.
Sometimes, they closed during office hours without any reason.