According to partyacargo.com, the Party-A-Cargo "offers the perfect hitch-mountable, self-contained beer kegerator/entertainment system". Simply put, it's a complete tailgating system, minus the grill. The kegerator portion of the system sports room for a 5 gallon mini-keg, a battery powered cooling system, and even its own CO2 and regulator system to turn your truck or SUV into a beer tap on wheels! And not only that - the entertainment system includes a satellite radio, 230 W speakers, a 10" sub-woofer, and a CD player to provide the tunes. All for "only" $3800!
Obviously this system is meant for serious habitual tailgaters! You can get one of their basic systems for two thirds of that cost, but let's be real. If you are going to spend that much money, you might as well go all the way!