Thule smart clamp System (L2H2)(L3H2)(L4H2) Thule Professional accessories Capacity at 20 hour Rate (Ah): Thule Adapters For Wall Mounting Manufacturer Capacity at 20 hour Rate (Ah): 100Cold Cranking Performance (Amps) EN1: 750 Available in a set of two 4m Set of 2 base rails with smart clamps Van roof should be clear of obstacles within 10 cm of the fix points Easy installation without drilling by mounting the smart clamps to the van's existing fix points Base rails are glued onto the vehicle roof and connected with the smart clamps Possible to expand the roof rack with a Thule awning retrofit installation possible (use awning adapter 301651 or 301652) Option to add two or more load bars to allow fitting of roof accessories such as roof boxes and carriers for sportsgear If vehicle has awning fitted