Made a little more progress, I received the 1/0 DLO cable and was able to run a 1/0 negative from under the center console, drilled the holes through the truck floor for the wiring for the 120v 50 amp shore power, 30 amp outlet from inverter, charge line from truck alternator and to lift gate plug mounted in the bed of the truck.
I got the enclosure mounted in the back seat area, it bolts to the mounts for the rear seats and seat belts. Still have to finish covering the top of the enclosure, ordering batteries soon now that I have a spot to put them.
Inverter enclosure install