DETROIT (AP) - Ford Motor Co. (F) says it will soon offer wireless mobile offices in its F-series pickups, an option aimed at building contractors and others who do business on the road. A Ford F-250 Super Duty truck equipped with a mobile office is scheduled to debut Tuesday at the Specialty Equipment Market Association show in Las Vegas. The annual show isn't open to the public, but it dazzles an estimated 100,000 automotive insiders with souped-up vehicles and the latest aftermarket trends and components. Ford expects to offer the mobile office as a dealer-installed accessory in 2006. Pricing isn't...