Hendrickson Fully Integrated Top-Mount Air Suspension/Axle/Brake System Model AAT 25K Worldwide, OEMs, fleets and owner operators put their trust in INTRAAX®. INTRAAX continues to prove its reliability and performance, piling up thousands of miles on tens of thousands of trailers worldwide every year. With a reputation for low maintenance and durability, INTRAAX costs less to operate over the long haul and helps keep rigs on the road longer. The versatile AAT 23K / 25K / 30K models are ideal for platforms, tankers, dumps, grain hoppers and specialty trailers – on-highway or off road.