I kept my air bags and wireless kit from my GMC when I sold it.
Sold the bags on evilbay and just added the wireless kit to my Hensley TS-3 air ride hitch.

Nice being able to adjust the hitch from the comfort of the front seat.
The system uses a compressor control circuit. I used that circuit to control an air horn 12 volt solenoid.

I added an on/off switch so I could manually dump the bags with the pictured push button.

The brass valves in the center are one way check valves. I have this plumbed so that the two control solenoids inflate - deflate the bags independently, but allow me to manually dump both bags with the system turned off.

I left the hitch's air compressor in place in case I ever have a supply issue from the on board air system.

 

Very nice work!

 

Forgot to add, the supply is coming from a volume tank using a Viair regulator set at 110 PSI