SAFETY CHAINS
Safety chains on your boat trailer provide added insurance
that it will not become completely detached from the towing
vehicle while underway. Crisscross the chains under the
trailer tongue to prevent the tongue from dropping to the
road if the trailer separates from the hitch ball (Figure 4-1).
Safety chain should be of the “proof coil” type and must
have a minimum breaking strength equal to the upper limit
of the GVWR. Some states require chains to be locked so
hooks can’t shake, bounce or vibrate off the bracket.
https://www.boat-manuals.com/lund/
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