What I know is that it requires you to remove your trailer hitch and use the one built into their system. That's why it won't work for me... I use the Torklift Superhitch because of my Lance camper.
That's a shame too because I've heard the Kelderman setup is superior to (and cheaper than) Fleetco's setup.
There's a rumor that Airlift is working on a full air suspension, but no telling when it'll become available.
Rob