easy rear lift?

While they may be able to handle the load the mounts are not designed for it. Remember that production lines tolerances varied wildly from car to car and year to year. Air springs used to lift a cars bind up the suspension and load a structure of the car not designed to support the car. Some cars will handle it just fine, but since we do not know the condition or intended use of the car it is safer to assume the worst.

Air shock wouldn't have saved this car

http://www.stamey.info/images/Temp/HomeDepotTrip.jpg