The Roadmaax Z Rear Air Suspension System from Hendrickson has a 46,000-lb. capacity and is approved for use with lift axles and up to 25% off-highway operation. Featuring Hendrickson's Zero Maintenance Damping technology, the Roadmaax Z is scalable with rated capacities of 23,000 lbs., 46,000 lbs., and 69,000 lbs. The system also offers a compact design that can integrate to common OE cross members, as well as a rebound control bar and drop-in shims for easier axle alignment.