The location of the Rail Gear determines the approach and departure angles for trucks with Rail Gear. The 1515 Rail Gear retracts toward the tires to deliver a better approach and departure angle that any other Rail Gear installed on light duty trucks. When going off-rail the driver needs as much clearance as he can get to drive along the right-a-way. Mitchell 1515 Rail Gear allows the truck to go where other trucks cannot go as a result of a design that has the great approach and departure angles. Ground clearance is important too; the last thing you want is the rail wheels bottoming out on a curb.