Make Model Spec CANTER OPTCANTER. 3.0 LUTON, CHASSIS CAB 3.5 TONNECANTER. 3.0 LUTON, CHASSIS CAB 7.5 TONNECANTER. 3.9 CHASSIS CAB 7.5 TONNECANTER. 4X4CANTER. BASECANTER. OPT What should my pressure be?