Maxie, the Vogue/Vogue-II of that era were constructed on Gillig Chassis and were CAT diesel and Allison Transmission powered. I would *assume* they should have their own air source. I'm still not real clear on what rear air cylinder tanks you're referring to... perhaps the braking system?
You should probably call Gillig to start with: Gillig's website
If you give them the VIN# they may be better able to help you.
Edit: Does yours look like this? http://www.rvt.com/rvdetail1495174.htm