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Do you have a better shot of the box's name plate? Is there one on those wheel sets? I ask because they look detachable.
You could shoot the company an email with a photo attached to: solutions@gichnerss.com
I couldn't dig up anything with that model number. Here's their current offerings but nothing fits the pictures you have.
http://www.gichner.us/products.html
Also, if anybody wants help wrenching on trucks shoot me a PM. I work and go to school full time so I don't have a ton of time but...