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Tandem axle trailers get a rocking motion between the two wheel sets that a single wheel chock can't fully stop. The Blaylock EZ-100 is built for exactly that gap — it locks in between the wheels of a dual-axle setup, taking out the play that makes a trailer feel unsteady during hookup or while parked.
A solid pick for anyone who's felt that tandem-axle wobble and wants one tool that both stabilizes and secures the trailer.