Originally Posted by jfowler218
...It seems like I have read somewhere that you can get tongue load using a bathroom scale, but I can't find the article...
Try this page:
The trick for accuracy is to have accurate measurements on the load, the fulcrum and the supports.
Be SURE the trailer is at the EXACT same angle as your tow hookup. With the tongue just a couple of inches above or below "tow level" a significant amount of weight is transfered to the front axle, the rear axle, and/or the tongue.
BTW, for usually less than 20 bucks you can weigh your entire unit at a commercial scale a half dozen times and get an accurate weight on the axles and wheels individually. In addition, you can determine the proper linkage setting on the weight distributing bars by actual weight measurement - much better than the "measure the inches from the bumper to the ground" method.
Look around where the "big rigs" hang out for the commercial scale locations - Interstate truck stops, cement yards, grain elevators - during "off hours" most places I have stopped at have been happy to oblige (and help).
Please report back with your results - both on the AS and the Tow Vehicle.