Paragon's idea is good to get you going quick.
But, how about getting a high amperage Jump-n-Carry with the continuous DC charge circuit and run the inverter off of that. Keep it plugged into the truck when not-tailgating, and unplug it when tailgating to prevent accidental discharge since the accessory outlets aren't on on a RAP (retained accessory power) circuit.
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'03 pewter base H2
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