Well, U could a small 1000W inverter, pure sine, and mount somewhere under dash, run wires out foot board to battery and perm hook up with an inline fuse, or maybe find a high enough amp live wire inside console/under dash to hookup and wire into. That would be the other option. Even the newer 400W plugs on the new truck not really made to max out. That would be my thought on all that.
U might want to talk to some of the better PPL that do all sorts of add ons and they may be able to lead you to wires inside,. Some PPL even add on small fuse boxes under the hood for added power options, way beyond what I know how to do. I would just run a positive/negative out to battery with a "fuse block" attached to positive side of battery and hook up.