Some embodiments of a system for separating cargo spaces in a temperature-controlled cargo container (such as a refrigerated trailer) can include first and second panels that are mountable in an interior space of the cargo container by a track-mounting system to movably support the first and second half-width bulkhead panels in the trailer. The first and second panels may have a generally flexible construction to absorb impacts from cargo, forklifts, or the like, but may also include stiffening members that are coupled to the first and second panels to provide added rigidity in particular orientations.