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I used to offer a hand-made, cast resin version of this CPS-Manac 40' grain trailer a while back. After trashing my styrene master I hesitated trying to repair or rebuild it because it took so long in the first place (about a month). Recently, with TinkerCAD I was able to reproduce the model in much better, more precise detail in two days. This model represents a contemporary hopper-bottom grain trailer. It will require a class eight, heavy-duty tandem-axle tractor to handle it. I'm working on that as well.