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This file produces a log truck with two bunks and a trailer with double tandem axle configuration. It's not just a trailer, as I do include two bunks that you can use on a truck frame. I do offer a number of frame extensions that would be suitable if you so desire. The tongue of the trailer will move up and down, the tandem dolly swivels. Please strongly consider replacing the enclosed pins with either metal or styrene rod or the like for the additional strength. The bunk tips can be positioned up or down, but the swivel pins are extremely small and fragile, so personally I'd pick a position, either extended up or folded, and then glue in place. Should there be any questions or comments, contact me via the designer link or direct via email at email@example.com