http://www.tiedown.com/pdf/c100a.pdf
HITCHING TRAILER
1. The vehicle, towing hitch and ball must have a rating equal to or greater than trailer GVWR.
2. Model 66 will accept 2" trailer hitch balls only. Trailer balls larger than 2.00” or out of round will not fit the coupler or may result incoupler failure. Balls smaller than 1.970” can cause shock loading and sudden disconnection. Make certain ball latch is in correctposition to retain the hitch ball. Push latch back until safety latch engages plate below latch. Insert safety pin into forward hole as asafety lock for the hitch ball coupler prior to towing. Do not tow trailer if coupler is damaged.
3. Connect safety cables or chains using crossed pattern under tongue, or follow trailer manufacturer's directions.
4. Connect actuator breakaway cable S-hook to the tow vehicle only. Do not connect S-hook to the safety cables or chains.
5. The breakaway system is designed to only operate after the trailer detaches from the tow vehicle and the safety chains have failed. Thebreakaway is not a parking brake. Do not use as such.
6. If the breakaway is accidentally applied while un-hitching, insert a flat bladed screwdriver into the spring clip slotted hole under theactuator and pry down to release.
7. Any control devices that restrict operation of the actuator cannot be used. This includes certain sway control devices.The actuator must be free to telescope in response to braking requirements.
8. Equalizing or weight distributing hitches may be used, allow six to eight inches free chain length.DANGER: Tongue weight beyond rating limits will interfere with performance of actuator, and braking system, and the tow vehicle.
9. The actuator is designed for use with Free-Backing trailer brakes. To block braking action, (in order to back up) with other types ofbrakes, use an electric solenoid. For trailer movement when brakes are not required, place the safety pin in the upper hole on the sideof the actuator to block movement of the actuator. DANGER: Failure to remove pin will also prevent forward braking. Pin must be inthe lower, forward hole as a safety lock for the hitch ball coupler latch when towing at all times.