I haven't yet. I actually tried to buy a new eq hitch with a scale built in since my hitch is the old chain style and has no sway control. Unfortunately the one I want is on back order. But I have pulled a lot of trailers, actually grew up around them as my family had an Rv dealership for 26 years. I can kind of just tell if they are pretty close or not. Of course if you don't have enough tongue weight you get sway, especially at highway speeds. Same way you can tell if they are front heavy, especially when you put the distribution bars on. My bars are the old style with the chains. I kinda of just know how much pressure it should take to pull them up with how many links are hanging.
I could tell it was a little front heavy when it was new and completely stock. On our trip with the sxs loaded I could tell I was a little light on tongue weight. Not enough to sway at 75mph. But I did have to tap my trailer brakes a couple times on some big bumps. New trailer, so could just be how it is. But I think it needed a little more tongue weight. Haha, but we have since loaded more stuff in it, including a new grill, ect. Most of it went in the gear tunnel upfront. I'm thinking it will be about right now. Once I get done changing stuff and hopefully get my new hitch. I'll take the loaded trailer by some cat scales to know for sure.
Plus side BOOST actually weighs each individual trailer as they come off the factory floor. So I atleast know what the starting point was for total weight and available cargo capacity.