with the sand bags in the back of my truck for the winter, one behind each wheel well and one in the center at the tailgate, when i take them out i sit fine, but with them in my truck sags to the left bad, its noticed more in the front then the back, does that even make any sence?!?!? i noticed it most today under the truck when i changed the oil grese and flushed it, seams like somethings just not right, what could it be??