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. ...
The problem with getting side/wheel position weights on Cat scales is that most have the pavement on either side of them sloping away from the scales for drainage.
If not perfectly level, side to side weights will not be accurate.