Rear Suspension problems of the 2008 Nissan Armada

My complaint is with the load leving system on the Nissan Armada. I own a 2008 Armada and the rear shocks were replaced shorty after the purchase because of the lose of air. The air lines have been replaced on 2 different occasions at different dealers because of leaks. In Jan. Of 2011 another air line was replaced and 2 weeks later I blew an air shock 750 miles from home. Once again another shock was replaced and now I have the same problem, the system will not hold air and is extremely dangerous when towing. Please note the mileage, mph and date are for the next to last failure. The latest failure happens all the time. Also note this is a company owned unit.

The auto leveling suspension fails/leaks. After everytime the vehicle is shutdown the rear suspension system leaks causing the back end to ride lower. After vehicle start up the compressor comes on and raises the back end to level. After the compressor shuts off the back end drops again. During towing is when the real safety issue happens. The back end rides very low and the compressor is not able to keep ahead of the leak, causing the back end to continue to ride dangerously low. This causes the back end to be very unstable during towing and could cause an accident.