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The Chock & Lock XL is an adjustable, one-piece wheel chock built to anchor between the two wheels of a tandem axle, so the wheels work against each other to resist front-to-back motion regardless of ground slope.
It's made from heavy-gauge steel with a corrosion-resistant zinc finish, adjusts from 4.5" collapsed to 10" expanded, and can be padlocked in place for extra theft deterrence (lock not included).
Backed by a manufacturer's lifetime warranty, it's a simple, tool-free way to steady a parked tandem-axle trailer or 5th wheel.