an arrangement for shifting a piece of furniture through an opening in a vertical partition , such as a wall of a vehicle includes a linkage system which maintains the orientation of the piece of furniture as it is moved between two extreme positions , wherein one of the positions is offset to be lower than the other position . when incorporated in a vehicle , the lateral offset between the two extreme positions is approximately equal to the height of the floor of the vehicle above a ground surface so that if the piece of furniture is a kitchen unit , such as a stove , its working surfaces will be at the same height for use inside the vehicle as when used in the outer position outside the vehicle .