In the backcountry, an on-board air system is often worth its weight in gold. The aforementioned air tank feeds this weather-protected air chuck as a pressure gauge reveals what's available. The aluminum tread plate panels are as aesthetic as they are functional, providing a steady step and protecting the blue sheet metal beneath them. The panel's outermost edge was TIG welded to the adjoining panel. Anyone familiar with TIG welding aluminum can recognize a good bead, such as this one.