Your "future air locker" is run off a T-fitting by the compressor? If so, its behind the check valve at the tank, the locker wont get to use the tank. 

Fantastic progress of the truck by the way 

noooo, its run straight off the compressor as the diagram shows, arb air compressors have two plugs for fittings, one is currently being used (or will be) for air tank for tires and what have you, the other will be plugged and awaiting install of the air silinoid that comes with the locker.

I would run your airchucks right off the tank with larger lines. So if you need to reset a bead or run an impact you get the most blast of pressure. Also I like your idea of the locker separate from the system. otherwise you would have to wait for the system to reach pressure before the locker would ingage. Looks sweet!

thank you! right now i have 1/4" line for it all, if i decide thats not enough its not too much to change it over. unfortunatly the tank i have only has an inlet and one other hole (not including drain) so im a little limited on how i run off the tank directly. but cant complain about the price