Of course, I'm just guessing now since I now have a green pass.
I used to love tailgating in the large red lot. It worked out great on several levels. It was the closest walk to the stadium. At the top of the hill is a walking path about 10-12 feet wide that took you directly onto Redskins property. There is a great grassy area for those who prefer grass to tailgate on or throw the football. A lengthy tree line that provided sun protection and a personal bathroom for the beer drinkers . I suspect the trees and weeds were well watered on home Sundays. Plenty of extra space to set up since there were no white lines; alhtough the church parking staff did start "organized parking" before the FedEx staff did on the FedEx Field lots. And lots of space to park with no worry of hunting down a parking space. Only problem was leaving right after the game; but I don't think it was any worse than the FedEx lots.