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This trailer is the type that's used to haul the corn or wheat heads off of a combine. It can be towed using a pickup or farm tractor. In this case, I've added a pin, as most diecast hitches seem to be loops, but of course, that can be easily removed. The round sprues on the piece are there simply to add some support to try and prevent warpage when printing or damage in shipping. Remove carefully, as this is a fragile piece. Any questions or concerns contact me via the designer link or direct via email to firstname.lastname@example.org