Nitro-
For the most part, people may take items from your coolers, but not the cooler itself. I've come out to an empty cooler before, but it's more of a rarity. Most theives are lazy and most thefts are crimes of oppotunity. They aren't going to lug a cooler around the parking lot, they'll just go back for more. I think the beer thefts are most likely underage kids, but again it's few and far between. Maybe I should throw some natty light on top before heading in?
I usually load my cooler in the back of the truck with the lid opening on the inside. If they really want into it, I don't mind, but it'll make it a tad harder. Just as long as they don't take my last beer...
The grill stays out, but it's big enough not to wander.
For the most part, use common sense. Lock up anything that could walk off that you don't want to lose, i.e. magnets, flags, your favorite koozie, etc. Everything else should be there when you return.
PS...as far as the Blue Crew invite - consider it open for every game. One and all are always welcome at The Blue Crew Tailgate.