In my working life I operated, a small fleet of dump trucks doing logging road construction on Vancouver Island. I had three different makes of suspension, Mack camel back, Hendrickson RT, and Pete Air trac. The trucks were always overloaded and very tight turn arounds while loaded and soft ground. The Hendrickson took more maintenance than the rest, broken spring eyes, broken springs, spring hangers. If you tried two transverse torque arms axles would not articulate very much, then reverse traction was terrible, so we only ran one on the rear axle. Camelback was very good traction and very little maintenance, and to my amazement the air trac was the best traction qnd least maintenance. When the PTO was engaged the air bags dumped.