[Shamu406]

John, I would suggest that as soon as you can safely get under the coach or get someone else under it, you change the petcock drain valves out to the plug cord valves.  That way you can drain the moisture out of the tanks on a routine basis without worry about crawling under the coach.  I just had to replace both of the two brake tanks you found behind the front axle.  They had rusted through from the inside and were starting to leak badly.  They are hard to find so it is a good idea to keep water out to the maximum extent possible.  I ran the pull cables through an opening in the back of the first compartment behind the wheels on the passenger side so I can easily access them.

Michael,
Where to get the plug cord valves? Did you replace the rear tanks as well?
Thanks!