Quick view Rhino-Rack Rhino-Rack 07-18 Jeep Wrangler JK 4 Door 3 Base Backbone Mounting System - RJKB1 Compare $539.99 The Rhino-Rack Backbone is an interior structure set up on the inside of the JEEP JK Wrangler. Three plates on each side of the JEEP's Hard Top are connected with the interior frame extending your roof line to vehiclery heavier loads with the max... Add to Cart Add to Cart