Found a place that sells a "kit" for building your own floor scale. My kit can handle 20K. The kit has all the guts you need, I need to provide my own platform. They recommend 3/4 or 1" aluminum. ...
I've never weighed my motorhome since I drove it off the showroom floor. Full of fuel, propane and water I headed to the scales and it was overweight. I've been RVing since 1976 and I have never weighed any of my RV's. I've never had any handling problems in any of my RV's. I guess I've just been lucky!