Anyone ever use Thrifty? If so, what are your thoughts on them? They have a cheaper price than Alamo, but I haven't seen any comments on them, so don't want to let a few bucks ruin our trip. Also, we need a vehicle to hold 7, so are looking at SUVs. Thrifty shows a Ford Explorer as a standard size and full size. However, they both hold 7 and 7 bags. Anyone know what the difference in standard and full is then? Thanks!