With all the discussion online I was motivated to weigh the tongue weight.
Here was my method:
*bathroom scale 2 feet to left of center
*3 different 1/4" boards to mark off 2 feet to left, and 1 foot to the right of center precisely, and under the jack stand in the middle (which you can't see in the photo)
*jack stand set to make camper level
*boards add on the right to make sure the 2x6 was level horizontally
You can click on the photo and zoom in to see how the 1/4" boards are set precisely at 0", 12", and 36" so I can take the bathroom scale weight x 3 to get the tongue weight.
(The photo is taken at an angle so it looks off at the bathroom scale's 36" mark, but it was dead on the 36" mark. I just took the photo straight on at the middle point, so there is a perspective angle difference.)