If you get the Rancho 9000XL, and if you live in an area where roads are salted... be advised that the salt will get into the adjustment mechanism and cause rust, resulting in the shock adjustment mechanism seizing, and loss of ability to adjust settings.
If you get the Rancho, take the plate off of each shock with an allen wrench (two screws). The adjustment knob comes off with the plate (does not pull off like the old 9000s). Treat the mechanism inside with some antiseize to prevent rust. I'd suggest rechecking each spring after the snow/road salt season is over.