To balance out frame heights lower than 80 mm (Mover® XT, XT 2, XT 4) or 110 mm (Mover® SR). Consists of assembly plates (each 170 mm tall) including screws and nuts. 1) 1) For the ALKO Vario III / AV-chassis, even when using the flat frame set it is not permitted to drill into the vehicle frame. Compare prices from: Truma in Camper & Caravan Accessories and Equipment