[markkitch]

Thank you Richard very helpful.

I agree with you on the regulators at the seals, for some reason there was a connection from high pressure at the 12 VDC compressor direct to the curb front slide seal.

Got it, the slides should be powered by 12 VDC compressor.

Good input on the red line (brake) check valve, this confused me a bit, I thought maybe for safety reasons the red line should not dump into the other systems. I think for now I am going to put a shutoff valve in that spot.

I do have a ping tank (curb side in front of drive tires). Is the pressure in the ping tank indicated in dash gauge (air supply, pic below)?

I am moving away from the incorrect configuration and toward the below schematic. 

Thanks for the help!




https://newellgurus.com/showthread.php?tid=4957
A couple of key concepts.
One, there should be regulators at the slide seals.
Two, you want the slide seals to be aired from the 12VDC slide.
Three, you may have the check valve in the wrong location and wrong orientation on your drawing. The idea is to prevent the 12VDC from trying to air up the suspension or brake tanks. So air from the 120 VAC and engine compressor can flow through the check valve to reach doors, seals, potties and such, but air from the 12VDC does not flow to the brakes and suspension.
Be aware that you may have a ping tank just above the passenger drive wheel where the check valve above is mounted.