Neil. I'd never seen anything like that either and it sure is a different arrangement.
Ken. You bet sand is a lot heavier than it looks. The FWD pulled itself and the loaded trailer but the tires are not aggressive enough for anything over 6% grade. Anyway here's a couple more pictures from the Show.
Reg's dozer and Euclid with the FWD behind.

Lou looking real casual with the 966 loading his ADT.

Just a general scene of the layout.

Thanks for looking.
Rob