BOAT TRAILER TIE-DOWNS — THE BOW STRAP ISN’T ENOUGH
The winch strap holds the boat forward; it does nothing about the hull lifting at highway speed. Enter your boat weight for the transom strap count and rating that keep it seated on the bunks.
Calculate the Right Number of Boat Trailer Straps — DOT Compliant
Boats shift differently from square cargo. Winch strap plus tie-downs — know exactly how many you need before the highway.
Enter your boat’s weight and hull length. The calculator returns the minimum tie-down count and WLL requirement under FMCSA §393.106.
A boat that moves on its trailer at speed creates an extreme road hazard. DOT cargo violations on trailers apply to private use on public roads.
Boat owners, marina operators, and anyone trailering a vessel on public roads.
- FMCSA 49 CFR §393.106
- DOT boat trailer securement guidance
- SAE J2638
CALCULATOR
Disclaimer: This tool is provided for educational and informational purposes only and does not constitute legal, safety, or professional advice. Sunferno Automotive Accessories cannot verify how products are installed, used, or attached in your specific vehicle or situation — proper installation, use, and securement are solely the responsibility of the user. Laws and regulations vary by jurisdiction and change over time; always confirm current requirements with your local authorities or a qualified professional. Sunferno products must be used strictly in accordance with manufacturer instructions and applicable regulations.
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