[Alaska Mike]

Take two two x fours about 16 inches long. Lay one about a foot from the scale and the other across the scale and the one next to the scale. Put a jack under the hitch of the trailer in the center of the board now bridging the scale and the two by four on the ground. The scale will support half of the weight of the tongue. Just double the number to know how much weight is on the tongue. As stated above 10 to 15 percent is about right.