Flatbeds are just one of many types of semi-trailers that are a common sight on American roads. They're known for their open, single-deck design resembling a bed, from which they derive the name.

Back in 2014, we looked at a particularly rugged, new off-road trailer from market newcomer Turtleback. In the three and a half years since, Turtleback's lineup has grown from a single trailer to a ...