First, you don't need a generator. Don't waste your money. Buy a deep cycle marine battery and an inverter. Plenty of juice to power a tailgate all day. Need more power? Buy another battery.
If you absolutely MUST buy a generator, which is silly since you don't really need one and it's a waste of money, PLEASE for the LOVE OF GOD, buy a Yamaha or a Honda so you don't annoy the crap our of you fellow tailgaters.