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We used to offer a hand-made, cast resin version of this CPS-Manac 40' grain trailer in our ebay store (http://stores.ebay.com/willmodels) a while back. After trashing our 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 about 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.