You should make it a habit to check the tightness of the tongue located inside your trailer coupler. The coupler is the device used to attach your trailer to the ball on your tow vehicle. The tongue is located by laying on the ground and looking up underneath the coupler. You will see the tongue, it rests under the bottom edge of the ball when the trailer is secured to the tow vehicle. Over time, the ball will eat away at the top of the coupler on the inside. Using grease on your ball will slow the wear, but won’t end it. As the wear continues. the gap between the ball and the tongue of the coupler will increase and cause slop between the two components. The slop between the two components can become sever enough for the trailer, while in transit to dislodge its self from the tow vehicle and cause you a huge problem. Commercial guys and gals should really pay attention to this.
Lay on the ground and in most cases you will need a 3/4″socket or wrench. Turn the nut clockwise to tighten the nut. The nut is a compression nut so it will be very stiff. Don’t be alarmed , it is made this way so it won’t work its self loose. Tighten the nut 1/4 turn and check the locking mechanism for firmness. Keep doing this a 1/7″turn at a time. What you want to achieve is a trailer coupler lock that either won’t lock or is very firm. Once you reach this point, back off the nut 1/4 turn until the motion of the coupler lock is smooth. The tongue should now be right up under the bottom side of the ball and not touching the ball. Through continuous use the coupler will wear out and need to be replaced. You will see it start to wear through the top on the outside of the coupler. If you get to this point, take your trailer to a reputable trailer dealer and have the work done professionally.
Don’t take chances when so much can be involved!
Be safe out there!