Today's boating enthusiasts demand and deserve more from their investment than ever before. You boat deserves to be fully cradled both traveling down the road and while being stored on your trailer. This is the premise on which the Carnai "Concept" and Centerline Support System has set the standards for performance in hull support. The Concept System not only supports the sides of the hull-bottom, but down the keel-line of the boat with gangs of pivoting keel rolls. It's Centerline Keel Roller Support System automatically adjusts to the hull configuration of your boat each time you use it.