Larry, you have a very inventive mind. See if you can get CJ to post a picture of one flatcar load he built and see if anyone can guess where it came from. You'd appreciate it.
Skateboard axle
Here are some proto pics of a cool load I shot yesterday - 3 flat cars with Komatsu heavy equipment. I think these are the powertrain / frame assemblies for large dump trucks. I want to model these, probably starting with the core of a larger scale model.