PITTSBURG, Kan. — People traveled from as far as South Dakota and New Jersey to gather last weekend at Big Brutus — the world’s largest electric shovel — for a rally of similarly impressive, if not quite as massive, machines. In this case they were a variety of trucks, SUVs, vans and other vehicles outfitted for “overlanding.” Chris Holloway, organizer of the Big Iron Overland Rally, describes overlanding as a combination between “car camping” and off-roading. “We have very capable vehicles that can take us farther off-grid and that can show us different parts of the country that we’ve never seen,” he said.