This is a set of three open cargo trailers similar to those that U-Haul used to rent. They are designed to be printed in White Strong and flexible. Less money, but less detail.
I have beefed up the hitches so they should print OK now.
All models arrive unpainted shipped direct from Shapeways. Most have to be cleaned prior to painting. You can get more information at my website:
Dave's Model Railway Stuff (www.davesmrs.com).