Here's the link to the Prevost modification instructions - http://prevostparts.volvo.com/techni...f/Sb96-14B.pdf

It's confusing at best, because it covers many different models and configurations. As the coaches get newer it takes more hardware and time to get the job done right. I did this on my 89 and it is indeed simple and cheap. Block the coach up so it won't fall, get out your stubby wrenches, and swap the locations of 8 air lines on the rear suspension Norgrens, 4 on each side. You then need to make a wiring mod to make the tag indicator light/buzzer work correctly (if you don't, the light/buzzer will be on when it is down, off when up). Works great, and took me about 4 hours total in the driveway - a pit would easily cut 1-2 hours off. If your serial number is between G-192 and L-580, you lucked out.

The later models, starting with L-583, require more hardware, the installation of an inversion valve, and welding on a bracket to hold it, so the job is not nearly as simple.