A Curtainside is basically a flatbed with an upper structure mounted to the flatbed as a tarping system. Both trailers are of the flatbed variety and both are covered with a tarp system or curtain which can easily be moved out of the way, thereby providing ready access to the trailer for loading cargo. A Curtainside is basically a flatbed with an upper structure mounted to the flatbed as a tarping system. Both trailers are of the flatbed variety and both are covered with a tarp system or curtain which can easily be moved out of the way, thereby providing ready access to the trailer for loading cargo