When I saw the title of the thread I thought "Oh dear, someone else asking for the impossible?"
And then I read it!
Bloody hell, if this all works in practice without impacting upon the drivability of the car when it's not towing then it's mightily impressive!!
Any idea of likely cost and time to install?
I'd estimate 8 hours to install assuming brackets and harnesses were prefabricated.
2 hours to remove coil springs and install air springs
1 hour to install level sensors onto subframe.
2 hours to install compressor & wire up power
2 hours to route wiring & hoses
1 hour calibration / debug
I think the whole install can be done without removing any interior panels, and without drilling or cutting any part of the car.
My parts total so far is ~$1600. Big ticket items were:
(2) used rear air springs & pigtails $550
Compressor with bracket & pigtails $255
Solenoid bank & pigtail $120
If I sell a kit, it would probably just be the height sensors & brackets, cable harness, power supplies, fusing and PLC. Or maybe just the pre-programmed PLC, BOM, drawings and schematics.
Most people say the air suspension rides nicer than coils. The rear shock dampening will be fully adjustable too, Im planning on going full firm when towing!