I have a mate who is working over in the mines and got some footage for me of the rigs he sees on a daily basis. All are a Road train set up to transport from the processing plant to the port, or train depot for transport over seas. hope it give you some more ideas for some new builds. I am just working on building my first tipper, but that is for another thread!
http://www.youtube.com/watch?v=QjSsAM56OHc
Also, check out our version of the road train at the last meeting at WOT Hobbies, in Ringwood, Victoria, Australia. Enjoy.
http://www.youtube.com/watch?v=7KEnn_bfGyE