Jesse,
If you want to make you a temp setup that you could put in the back for when you go to tailgate, it would be pretty easy.
Make you a little box that would hold an optima battery and an inverter, making sure it can ventilate. Have your outlets on the outside of the box and either rig you up a plug to plug into your trailer plug or run a wire from the trailer plug up into the rear to plug into.
There is a POS at the trailer plug designed to charge/recharge batteries on trailers. On your little box you could but wire a voltmeter to the outside so you would know when to crank the truck to recharge the battery.
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