The foundation of the Saris Modular Hitch System (MHS). Modular Base works in conjunction with MHS Bike Carriers and Accessories (sold separately) to create a versatile and dependable platform rack system for all your gear hauling needs. - Saris Modular Hitch System (MHS) is a future-proof, highly customizable modular hitch platform system consisting of a Base unit and a wide assortment of Bike carriers and other gear carrying accessories. - MHS Hitch Base fits 2" receivers - Base accommodates 3 bike trays + 1 Add-On Bike Tray , sold separately - Convenient rear of vehicle access with tilting base activated with easy to use outboard handle - Compact storage on vehicle as base tilts up when not in use - Saris Hitch Tighter System locks and secures rack to vehicle with rock-solid hitch connection. - Includes hitch lock plus additional 4 lock cores for use with MHS Accessories - Fully assembled and easy to install on vehicle