[MARKGMC3]

There is some interesting stuff that an owner has added to this coach. First is a manual system for leveling. You see the valves and gauges in both the front HWH compartment and the rear engine compartment. It's not clear to me, if this supplements the six pack or replaces it.

The second is that an idler pulley and tensioning pulley has been added to the alternator and air con belt system. What's interesting is that the owner kept the v belt pulleys instead of installing serpentine belt pulleys. Theory is that V belts shouldn't be bent backwards. It would be great to hear from the owner on his experience with this setup.

Master,

The gauges, on/off valves and schrader valves are there to isolate the air bags and or air systems.
When I lose an airbag, solenoid or airline etc. I believe the air input and info will help me to keep going.

I added the idler and tensioning pulley because the V-belt would scream every time the Engine came off idle. Kept making it tighter and tighter ......ended up using a crow bar. The noise stopped but burned up the AC compressor and the alternator.  The new belt system has been on for about two years...no noise no problems. As I write this..... installing a small air cylinder to put 35lbs against the belt instead of the spring. Check the V-belt often and so far only one little crack. I do carry two spear belts.

Mark