Your heavy septic-hauling rig is propelled down the highway every day on several rubber tires. You routinely face heavy traffic, the potential for hitting debris on the roadway and the remote possibility of catastrophic tire failure. Pumpers almost always make their appointed rounds and return safely to the yard at night. Tragically, Werner Karl Letterman didn’t make it back from his route in Florida Dec. 27, and authorities blamed a blown tire for the crash that claimed his life.According to a story in the West Palm Beach Post, Letterman, 41, of Greenacres, Fla., was driving his Mr. Rooter truck northbound
