Lot B is really a hassle if you have alot of luggage. The shuttle buses don't run often enough, and they pack them to the gills before closing the door. Consequently, there's a better-than-good chance that you'll get stuck standing in the aisle for the commute to the terminals or back to your car. It's worth the extra few dollars a day IMHO to park in a lot where the shuttle driver will assist you with your luggage, and you can at least sit down for the duration of the ride.