Suspension conversion method and apparatus

摘要: Methods and apparatus for modifying a vehicle chassis. In one embodiment the modified is capable of being placed close to roadway at position suitable deployment wheel chair ramp that complies with ADA requirements. yet another embodiment, can be raised in which frame higher than it was when deployed, such provides crash worthiness relative side impacts. Yet other embodiments pertain vehicles have plurality wheels suspension biased by pneumatic spring. Various methods safely interlocking operation air springs controls vehicles.