X-Chocks help limit the movement of the rig when you're parked.
They are not intended to keep the rig from rolling down hill.
p.s. They self eject laterally if you forget to take them out
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2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
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