rear power outlet question 2013 trd sport

I have a 2013 sport with the power outlet in the bed. Now I live in Texas and dont do the extreme offroading many of the guys here do... It spends 99.9% of its life being a gas saving street truck and barely any type of "off the beaten path" driving. This will be my first summer with the truck and we do a lot of camping and tailgating throughout the warm months. I was wondering if there is a way to power the rear plug without having the truck on. Basically this would just run some camp/tent led lights for now more than a few hours at a time. Does someone offer an aftermarket switch or something of the sort for something like this? Bypasses the ignition and directly wires to the battery? We use a honda generator for most things at the campsites, but just figured id see if this was even an option at all

 

You could try this.

https://www.tacomaworld.com/threads/how-to-ac-outlet-in-cab-400-watt-anytime-mod.322320/

https://www.youtube.com/watch?v=85LmCQAfnEU