Lincoln NAUTILUS 2022 Owner's Manual page 307

Connecting a Trailer
Install trailer safety chains to the trailer hitch
as recommended by the manufacturer. Cross
the chains under the trailer coupler and allow
enough slack for turning tight corners. Do
not allow the chains to drag on the ground.
E265060
If the trailer safety chain hook has a latch,
make sure the latch is fully closed.
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2022 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202108, First-Printing