XA-R48
Slide Base, Fifth Wheel
SAF-Holland

This precision engineered sliding interface forms the core of the fifth wheel mating system in heavy duty tractor trailer applications. By providing controlled fore and aft travel at the hitch interface, it accommodates dynamic articulation during coupling and road motion, helping to align the kingpin with the crosstube and ensuring stable load transfer across a wide range of operating conditions. The design distributes vertical and lateral forces across hardened contact surfaces, minimizing wear on mating components and extending service life in demanding service. Precision machined pivots and robust fasteners promote repeatable hookup performance, reducing hookup time and nuisance misalignments after trailer maneuvers. In fleet service, technicians rely on this base to maintain or restore accurate alignment after wear or impact, preserving hitch integrity and operator confidence. The component is catalogued under the fifth wheel slide base family, aligns with standard SAF-Holland mounting patterns, and carries VMRS code 059-001-045 to identify its role within the sliding base subset. Its modular construction supports retrofit or new builds and pairs with compatible slide plates and locking mechanisms to deliver consistent performance across diverse trailer configurations in highway and vocational operations. Category context emphasizes Fifth Wheel assemblies, highlighting compatibility with SAF-Holland slide base ecosystems in applications ranging from regional haulers to heavy haul operations.