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You only need x, chocks if you don't have automatic levelers. Manually leveling requires you to raise one side with boards or stacker blocks and the weight of the trailer is still on the wheels. After you back on your boards and are satisfied with the side to side level you should insert and tighten the x chocks. Then complete your unhooking and leveling front to back.
With automatic levelers you only need to guard against the trailer sliding on the Jack pads if your site is really sloped. This can be accomplished using regular wheel chocks placed behind the two wheels on each side on the downslope side.
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