A plurality of structural members configured to be coupled together to form an array. Each structural member includes a top portion having a plurality of top extending members spaced apart from one another and a bottom portion having a plurality of bottom extending members spaced apart from one another. The top extending members and bottom extending members can be vertically offset from each other. The top portion of each structural member can be coupled to the bottom portion of another structural member, and each top extending member of a structural member can be coupled to a bottom extending member of another structural member.