I have one, takes some work to set up and I am not done yet, it did a great job of computing the truck weight but the TV/TT combination was way low, ~20% low. I wrote to the company and they gave me some things to try but I haven't had a chance to try them again. In hindsight I don't see the value given the effort and problems I am having with it. Cat scales far easier. If you want more details ask.