A height adjustable floor system for a motor vehicle includes a load compartment floor having front and rear floor members that are pivotally connected together to permit relative rotation about a transverse axis. The load compartment cover can be positioned in upper and lower load carrying positions and be moved between these positions with the aid of a pair of first side supports each having a continuous groove defining a path to be followed by a pair of spaced apart guide members located on left and right sides of the front floor member near to a front end thereof. The rear floor member is used to facilitate the transitioning of the load compartment floor between the two load carrying positions and the first side supports are so configured that in the load carrying positions load is not transferred from the load compartment floor to the guide members.