That’s what we did with Wilbur, the 500 pound boar that turned out to weigh 820 pounds! His hanging weight was 506. He was a BIG BOY.One of these times, go by a truck stop with scales, and get them to weigh the truck and trailer so you have a "base weight". Then the next time you take an animal, all you have to do is go by and get a loaded weight and you will have a pretty accurate weight on the animal/s in the trailer. Or you can take it loaded and then weigh after you unload on the way home, same trip, to know. Yeah, it costs a couple dollars to get a weight... if you go back within 24 hours it is a "reweigh" and usually only costs another dollar to do. But this will give you a lot better idea of weight.