I had a member post a link for me on a spreadsheet that Doc designed a while back that is really well done. We have been using the calculator at Run8Depot for the longest time now. The calculator works great but one of the issues with Run8 is it doesn't calculate trailing unit tonnage. It simulates it but it doesn't report it. There are a few other features dealing with the various rules and compliance that I found very interesting to see.

I'd be happy to develop our own based on the original design. I've reached out to Doc hoping he might still be around, but I believe he hasn't been for about a year now.