Made a trip from Florida, returned to Michigan on the 65, arrived north of Nashville. The pneumatic tit on the driver's side failed, so I rode on springs the rest of the way. Very disappointed in their system. and are currently trying to get a Firestone to back up their warranty. If the double shirred 6401 bags could handle 5,000 lbs and the weight of the tab on the axle was only 2,400 lbs. In an ideal world, there should have been enough. A certified mechanic installed the system for me before