as many of you know, its almost husker tailgaiting season. i have this awesome idea where it involves a large home stereo on the tailgate of a friends truck. im pretty sure its 500 watts, and i have a 200 watt subwoofer, and non powered tower speakers. I dont want to latch onto the vehicle battery, so what would i need to make this work? im thinking two car batteries? whos got my answer?

heres my receiver...

http://www3.dealtime.com/xPF-JVC-RX-6020V