Fast, low cost installation: Minimize chassis modifications with the of the R-Series air ride truck suspension. Installs in half of the time Elimination of axle misalignment Elimination of axle weaknesses Shock absorbers may be used to further reduce the cost of installation No track bars are needed The rub block provides a self-cleaning, no-maintenance wear surface for the axle tower-to-chassis frame contact Polyester retaining strap prevents over-extension of the shocks and air springs.