I'm looking at purchasing a new X738 with the air ride seat option. Has any one purchased this optional air ride seat with the X738 signature series ? If so does it float good really smooth the ride? I was in the truck selling business for 40 years. We had an option for an air ride seat with a truck that had hydraulic brakes. These were a self contained air ride system that was comparable to the seat in an over the road unit. There was little to no maintenance and they seemed to have long life cycle.