Abstract: A leaf spring for a vehicle suspension system, the leaf spring comprising a middle leaf plate located between an upper leaf plate and a lower leaf plate and a center bolt extending through an aperture of each of the leaf plates at a central region of the leaf spring, wherein the middle leaf plate has a wavy structure in the longitudinal direction where troughs and crests of waves of the wavy structure form longitudinally distributed contact points for transfer of load between the middle leaf plate and the upper and lower leaf plates, wherein the center bolt aperture of the middle leaf plate has an elongation in the longitudinal direction that is greater than that of the center bolt aperture of the upper and lower leaf plates so as to allow the middle leaf plate to move in the longitudinal direction relative to the upper and lower leaf plates.

Abstract: A wheel chock system. In one aspect of the invention, an actuator is configured to move a pair of wheel chocks to an activated position in which motion of the wheel is prevented. A control unit controls the actuator and, based upon determination that a plurality of predefined conditions are met, the control unit may after having received an operator-initiated activation request, cause the actuator to move the wheel chocks from the inactivated position to the activated position. In another aspect of the invention, the actuator comprises a bi-directional motor and a gear mechanism, for moving the wheel chocks to the activated position. The invention also relates to a vehicle comprising a wheel chock system.