It seems a little redundant to place a Mack R-Model in the still working category of the site due to their legendary toughness but here we are. David C. took a few photos of this well cared for Mack of the H&K Group while on a bridge rehab project last summer.
Stop by the H&K website for plenty of photos from this massive construction firm. As you would expect from a company based in Pennsylvania Mack trucks play a prominent roll in their equipment fleet.
Thanks to David for sharing!