A data recorder of the present invention comprises a recording unit, a condition determining unit, and an optimizing unit. The seat assembly has a base frame mounted to the floor of the vehicle. The at least one lubricant supply opening supplies the lubricant to a gap between the rear roller bearing and the rear bearing sleeve for formation of a squeeze film viscous damper therebetween. In another embodiment, the secondary power and network data conductors may by carried over an open rail system.