My dream year-round adventure and tailgating rig:
That HD TV retracts into the body when not in use, and there's a swing-out grill behind those few people on the left. Also a built-in awning.
Unfortunately, that's a half-million dollars or so.
Short of that, I keep it very simple: small camping stove/grill, cooler of food/beer, portable Bluetooth speaker, folding table and some folding camp chairs - basically just raid my camping cabinet for the needed gear.
Snowbasin's tailgating scene seems to grow every year, especially with a few bad seasons in a row. I don't usually like to waste the ski day out there, but I'm all about an apres tailgate.
I got a couple super-portable, disposable grills with the intention of having a lunch tailgate. They're small enough to fit in a backpack, preloaded with charcoal and figured I'd throw a couple beers and a pack of hot dogs in my backpack and tailgate on the actual mountain somewhere. Haven't tried it yet, but think it'd be equally fun - sure beats overpriced cafeteria food.