So, the wife drives a 99 Olds Silhouette van that has an self leveling rear air suspension (stock). I can't seem to find any info about the system online except that the compressor is about $350 from GMPartsDirect and it seems something like that may be a viable option for OBA. I've seen a ton of those vans (or similar GM models) at the junkyards and was wondering if anyone knows if it would be worth experimenting with or not. The compressor in her van maintains/adjusts the rear suspension and has an outlet for airing up tires/inflatable beds, etc and seems to have a decent CFM (no idea what PSI it puts out). Plus, it's 12V with it's own relays and pressure switch, as well as aux air on/off connection and switch, plus it's small enough to be hidden behind the interior panels of the van. Any input?