roofs
Roof truss systems specific to container dimensions, spanning sixteen or twenty feet, with four foot cantilevered eaves beyond that (24' or 28' overall), are useful for a wide variety of floor plans.
End-to-end roof trusses avoid the complexity and cost of hip roofs, so are better suited for quick assembly. They can be extended at either end using conventional post and beam support, either as original construction or as a later addition.