Longer Flatcar

This is a remixed version of the flatcar by jeff_j3ffr3y. I wanted a slightly longer car to use on my layout and did not like the stake holders on the sides, so I ported the thing to TinkerCad and modified it. I also fixed a few issues such as the holes for the kingpins (I'm not sure if they work). I also included coupler boxes (For some reason). Yes... Those are reader's digest trucks... They were the only ones I had on hand and they work ok.