I know and understand what you are saying here. I am looking at it in the real world. Very few people have a way to weight their trailer load. It takes common sense. When I pick up a lawn tractor I make a judgment how heavy is it, I don't know the exact weight. Now when I load it I have to make another judgment call by balancing it over the axle to make sure I have enough tongue weight but not too much. Unloaded the trailer is level which helps with this call. There is a lot of different between a push mower and a 1500 lb. garden tractor how I load it. There are also times also when you have a load that its hard to get that good balance. Common sense You don't go down the highway 60MPH but go a slower speed on the back roads. Other common sense things tie your load down proper, look for hoods that can fly open, light weight things can fly off your trailer. When you've are doing lawn service you know how to load your trailer and do it the same each time, when I pick up repairs no two loads are the same.