We just used Thrifty for the first time on our last trip and we were very pleased with the experience. The shuttle ride is not bad. My DH actually got to Thrifty, picked up the car, and got back to the terminal before our luggage arrived. We had reserved a Dodge Intrepid but they were out of them. Clerk at Thrifty asked DH if he wanted a Ford Taurus instead. My DH said no because we had had problems with that type of car before. Clerk offered to upgrade us to a Dodge Grand Caravan at no additional cost. DH, of course, said yes. We ended up paying less for the mini-van than the full-size, $371.00 for 17 days. The full-size was reserved at $375.00 for 17 days. No problems with the added insurance as the clerk never mentioned it. Would definitely recommend that you join their Blue Chip program as you get a special line to wait in and no hassles about insurance. You can do this through the Thrifty website.
BTW, you can also try the WMRT code and see what that brings up.