Thanks for all the help, guys.
So, for my 96 Fleetwood with 9C1 springs, I need to:
1. Get the right length Air Lift air bags for these springs.
2. Install the air bags upside down for air line clearance.
3. Use compression coupling(s) to connect the air bag lines to the factory line(s).
4. Replace spring or remove diaphragm in pump to reduce pressure.
It sounds like removing the diaphragm might be the best solution, but I wonder if there are any downsides to doing this?