A maker of heavy- and medium-duty trucks is looking at building a retail and service center on Thurmon Tanner Parkway in Oakwood. The owners of a 7-acre parcel between Oakwood and Plainview roads are negotiating with Kenworth Trucking to buy the site, then build the center, which would be between 40,000 and 50,000 square feet in size, according to Oakwood paperwork. “We are evaluating several options at this time, but a decision has not been made,” said Michelle Faul at MHC Kenworth headquarters in Kansas City.