Patrol GU S4+ Cab Chassis (Coil) Rear Adjustable Upper Trailing ArmDESCRIPTION Trailing arms are some of the most exposed suspension components on a lifted 4x4 and are prone to bending and breaking. Ironman 4x4 has resolved this common problem by producing heavy duty ADR approved, adjustable upper trailing arms. Trailing arms are some of the most exposed suspension components on a lifted 4x4 and are prone to bending and breaking. Ironman 4x4 has resolved this common problem by producing heavy duty ADR approved,