Abstract: A tractor cab suspension system includes a plurality of suspension members arranged for supporting the cab on the frame in which some of the suspension members at one end of the cab comprise resilient members compressed between the cab and the frame of the tractor and other ones of the suspension members at the other end of the cab comprise air cushion members. A rollover protection member is associated with each air cushion member to resist separation of the cab from the frame at the cushion member during a rollover of the tractor. The rollover protection members are arranged to couple the cab and the frame for linear sliding movement relative to one another.