Flatbeds are just one of many types of semi-trailers ... made of steel, including bridges and dams where it serves similar weight-bearing and load distribution purposes. On flatbed semi-trailers ...

The 4000A comes with an air-ride suspension and has an 80,000-pound distributed-load rating. The 4000S is an all-steel flatbed trailer designed for heavy-duty use. It has a main beam capacity of ...

Utility Trailer ... steel main beams. For added stability, three tube-shaped outriggers are located on each side of the 4000AE and are connected to the aluminum crossmembers, aiding in even load ...