When a worn or damaged support arm compromises your rig's leveling system, this heavy-gauge steel replacement gets your Lippert electric stabilizer jack back in service. Built to the same geometry as the original, it drops in without fabrication or modification.
The Lippert 1134121 support arm is the factory replacement for the structural arm that connects to the scissor mechanism on Lippert high-speed and ultra-lite power stabilizer jacks. Over time, arms can bend under load, corrode, or strip at mounting holes -- this replacement restores full jack geometry and load distribution without requiring a complete jack assembly swap.
At 19-5/16 in. end-to-end with a center-to-center mounting hole span of 17-13/16 in., the arm matches OEM dimensions exactly, so bolt patterns line up and the jack travels its full range of motion without binding. The powder-coated black steel finish resists road spray, mud, and seasonal weathering.
Formed from heavy-gauge steel to handle the side loads and compressive forces that stabilizer jack arms experience under an occupied trailer or fifth wheel.
Black powder-coat provides corrosion resistance against road salt, moisture, and UV exposure -- same durable finish used on Lippert OEM assemblies.
17-13/16 in. center-to-center hole spacing matches original jack geometry, ensuring proper alignment with the scissor pivot points and motor bracket.
Cross-references to Keystone RV Part Number 361389, making it easy to verify the correct arm for Keystone-built trailers equipped with Lippert electric jacks.
This listing includes one (1) replacement support arm only. Mounting hardware (bolts, nuts, washers, cotter pins) is not included and must be sourced separately or reused from the original assembly if undamaged. Confirm hardware thread size and grade with your existing jack assembly before ordering fasteners.
This support arm is designed to work with Lippert electric stabilizer jack assemblies in the high-speed and ultra-lite power stabilizer jack families. These jacks are common on mid-to-late model travel trailers and fifth wheels from Keystone, Forest River, Grand Design, and other manufacturers that spec Lippert running gear.
Replacing a stabilizer jack support arm is a straightforward swap on most trailers -- extend the jack fully for easier access, remove the pivot hardware, swap the arm, and reinstall. No special tools are required beyond basic hand tools. Cycle the jack through its full range of motion after installation to confirm smooth travel and proper alignment before loading the trailer.