I do not have a sciencetific explantion as to how to accurately calculate the tongue weight. However, I have been pulling trailers behind my motorcycles for over 10 years now. I have heard and read that using a fish scale is a very accurate way of getting the exact weight. And it does make sence. What I have done is lift up the trailer while empty with two fingers (no reason for two fingers) and get a feel for the empty weight. I then load my trailer using common sence. Most of the weight (the majority) on the wheels, a little more behind the wheels and as light as I can infront of the wheels, I then check the weight by lifting up on the tongue again and see if it feels about the same or as close as possible. I also set the empty trailer on the hitch to see how much the bike settles, then do the same thing when the trailer is loaded. These methods have worked successfully for me over the years. Again, common sence and proper hitch/trailer alignment, weight distribution, setting the bike preload, and tire pressure(s) all affect the handling of the bike and trailer. Hope this is somewhat helpful. Works for me.....This is a very interesting topic to me because I am considering a trailer and a trailer thread got me to considering how to do that.
Question: How do you confirm the tongue weight? In other words, how do you go about knowing how much weight you are putting on the tongue? What is the process for calculating that weight?