this requires a handful of m2.3 or 2.6 screws of varying length and 4 608 bearings (that's the size that most fidget spinners have) I also recommend using 4 49.5x14 popular brick tires but if you use the 20 mm rims you can print the tires linked here https://www.printables.com/model/768914-118-scale-flatbed-trailer instead or use popular brick 49.5x20 tires

I am planning on making a gooseneck version of the trailer very soon.

The deck is about 12 inches long without the 4 inch tail and 5.5 inches wide. I was able to print this entirely on my Bambu Labs a1 mini. The largest single part is 140x115x51mm.