I don't personally ... but I know a man who can. Pete Rowlinson has developed "a powerful planning tool, allowing the detailed analysis of range, payload and performance of an aircraft with realistic AUWs and accurate performance data for all operating conditions. By bringing together real loading data and comprehensive performance information, 'What if?' scenarios can be run in seconds, with answers displayed immediately in e********'s easy to understand graphical format."
Try
http://www.aerotechuk.com/easyweigh.html