The Rhino-Rack Backbone is a mounting system for your Toyota Tundra Crewmax. Connecting to your vehicle's roof via 3bases on each side, it allows for a Rhino-Rack Pioneer System to be fitted on top.. Rhino-Rack 07-20 Toyota Tundra CrewMax 3 Base Backbone Mounting System. Minimizes Wind Drag And Noise On The Road. Fits Pioneer Platforms 42113B And 42113BF. Made From Non Corrosive Stainless Steel. Compatible w/Rhino-Rack Pioneer Range. Stylish And Aerodynamically Designed. Allows Maximum vehiclerying Capacity. Made From Strong Durable Materials. TOYOTA TUNDRA 07+CREW MAX B/BONE. Backbone 2 Base Mounting System. 1 Hour Installation Time. Roof Rack Mount Kit

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