Tongue weight is the downward force exerted on the hitch ball by the trailer coupler. Incorrectly balanced tongue weight can lead to jackknifing and loss of control.
Too much tongue weight: If the wheel well is crowding your tires, you have too much tongue weight. Solve it by moving heavier items toward the center of your trailer.
Not enough tongue weight: If there is too much weight in the rear of your trailer, it can actually lift the rear of the truck a bit, resulting in negative tongue weight. Again, solve it by moving heavier items toward the center of your trailer.
Balanced tongue weight: A correctly balanced tongue gives you full control of both your truck and trailer. If your trailer’s tongue is parallel to the ground, it is balanced correctly.