just found this thread, or i'd have answered sooner
i have the 7-9" kit (rear) on mine, it's awesome, brackets and rods are massive. rides like a caddy. right now, i'm using it the way they send it, a bag pressure gauge (dual needles, one bags, one tank). when i get to stay home long enough, i have a ride height valve and a dump valve from freightliner. i looked and measured, it will mount on a crossmember, centered over the diff, and i'll be mounting the other end off an existing tab (either the park brake cable clamp, or brake line mount clamp, i'm 9000 miles away from it right now). i need to figure out the plumbing, but it's fairly simple.
it will hold a set ride height, regardless of load, and i can dump it from the cab. right now, it tows a trailer great, but i need to add air every hr or so, leak might be on gauge, need to find it. it comes with a rocker switch, add or dump air with it, compressor used a switched power supply, to a relay, and an auto pressure on/off.
check out Kelderman Air Ride
(i think) and see the video of the dodge, it can be raised and lowered close to 10" while driving
i paid around $4400 for the rear with the bilstiens, they said $1500 more to add air bags and 4 link to the front.
biggest thing i liked, was they know their fords, first time i got a warm fuzzy about axle tube sizes and so on, that i was dealing with a company who knew their stuff.
i mounted the tank in the rear, to the spare tire crossmember (tire is in the bed) and my buddy built a mount, the compressor is in the bed, mounted to the left side just ahead of the rear upright (i have a shell, weather is not an issue)
this is the best thing i've done to the truck, wish i'd done it first, instead of screwing around with 3 sets of rear leafs and 3 sets of blocks, and it still rode like crap, and never sat right.
i'll be taking some better pic's while i'm home, and get them on from a decent internet connection, with some close ups of the kit, mid nov or so