For clarity purposes, weld 24 is represented in FIG. 2 only as securing solid member 18B within hollow member 16B. However, it is contemplated that each solid member 18A and 18B is secured within (as illustrated in FIGS. 2, 3, and 5) or secured to (as illustrated in FIGS. 4 and 5) hollow members via a weld, solder, or other means.