Toyota Motor Corp (7203.T) on Thursday said it will hire 1,000 additional staff for its new U.S. base under construction in a Dallas suburb.Toyota's new 100-acre (40.5-hectare) headquarters campus in Plano, Texas is set to open in mid-2017, and will employ about 4,000, including the new hires, Toyota said.“We will be hiring more than 1,000 new team...