My Missus Citroen C5 has Hydraulic suspension, extremely useful when towing my roadlocostder to track days, just pull up, raise the ride height all the way and the back end of the transporter trailer touches the floor, pop ramps on and drive car off - simples! Not exactly related to the thread but i thought i'd just mention it
You could always have a go at it though, butcher the hydraulic suspension from a citroen BX or something?