A General Motors factory in Dayton, Ohio, is gearing up to build seven-seat versions of popular new mid-sized (outside the USA, read "large") SUVs, Associated Press (AP) said. The plant will begin producing pilot Chevrolet TrailBlazer EXT and GMC Envoy XL vehicles in early April, with dealer-ready models expected later that month, AP said, adding that full production will be reached by late May.