An extensible payload system including mounting equipment and a mast system removably coupled to the mounting equipment. The mast system includes a plurality of nested mast sections, at least one cable, and a pull block assembly. The plurality of nested mast sections include a first mast section and a second mast section nested within the first mast section. At least one cable is rollably coupled to the first mast section. The pull block assembly is coupled to an end of the second mast section. The pull block assembly has a cable receiving opening. The cable is routed into the cable receiving opening and is coupled to the pull block assembly.