Ensure the mounting hole for the ball does not exceed the ball’s shank diameter by more than .06” (1/16”).
Ensure your hitch ball is properly attached and secured to the ball mount with the lock washer between the ball’s nut and the ball mount.
Ensure the nut is tightened to the proper torque (160 ftlb for ¾” ball shaft diameter, 250 ftlb for 1.0” ball shaft diameter and 450 ftlb for 1 ¼” ball shaft diameter).
Ensure ball thread extends at least 1 thread beyond the nut
Place a small amount of grease on the ball before towing
Ensure your hitch Ball spherical diameter matches the coupler socket diameter
Ball mount shank size matches your receiver hitch box size (1 ¼”, 2”, 2 ½” etc)
Ensure ball mount is secured into the hitch box receiver with the proper sized hitch pin or lock (For 1 1/4” inch receivers or for 2” and 2 ½” inch pin diameter)
Ensure ball is fully seated / engaged into the coupler and that the coupler handle is down in the locked or secured position and a coupler handle safety pin is in place through the coupler handle
Trailer Jack is fully retracted or swung out of the way
Safety chains are properly installed, crisscrossed under the coupler
Electrical is plugged in and trailer lights function properly
Trailer lights function properly
Brake controller is properly installed and properly adjusted to the trailer’s weight
