Finished my onboard air install.
Everything starts with ARB twin cylinder air compressor. I built a shelf to mount it on and it turns out I've bolted a lot to this shelf including the fuse for the switch pros, breaker for the stereo amps, relay for the winch/battery switch-over and numerous wire harnesses mounted below.
I ran stainless steel 1/4 tube to the air locker manifold. Since it crosses the red-arc battery switch, had to cover with a cheap wire split loom. The manifold is wired up for ARB lockers, just need to buy and install them.
I used DOT air brake line to run air to a rear firestone 2 gallon air tank mounted to the four bolts that hold on the hitch receiver. Overbuilt a 3/16th inch bracket to hold the air tank.
I wanted a large volume of air to seating beads so I ran a much larger tube from the tank to a wits end 6 way manifold and then larger tube to a brass bulkhead fitting in the rear bumper.
On the rear bumper, install a quick disconnect for airing tires, seating beads or air tools.
I then ran a second DOT air brake line back up the frame rail to the front where I came out below the front bib and through the frame rail. Installed another brass bulkhead and quick disconnect. With the smaller line, this is mainly for tires.
The things I liked about this install include, the awesome push connects for the DOT brake line and barbed push connects for the larger tube. I was also impressed with the wits end manifold, it was high quality and came with mounting hardware.
I wasn't happy with the size of the hold I cut in the inside frame rail to fit a 1" socket to tighten the bulkhead connector. Also don't like how high the 90 degree elbow sticks above my air compressor. I might redo that line with the DOT brake line and push connectors.