I have an option to purchase a Firestone airlift kit from the rear of a Ford Dually. Sounds slightly extreme, but they would be going into the rear of my Caddy. Can someone who has installed Firestones under a Caddy chime in please: did this work for you, I understand Ill have to redrill holes on the mounting plates, etc, but is this a feasible project or should I back off? The bag kit is for sale locally for $250.