Trailer Stopper Tongue Jack Wheel Dock Chock Stabilizer Prevents Trailer Jack Wheels from Sinking into Sand Grass Mud. Heavy duty trailer wheel dock is designed to prevent trailer jack tongue wheel from moving or sinking into soft foundations like mud, sand, dirt, gravel, grass, and more, the wheel dock is perfect for RV trailers, boat trailers, pop-up camper trailers, camping and tent trailers.
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