I have a typical 24' wide modular home. I would like to remove the wall between the kitchen and livingroom to make it more open. The wall is currently 13 feet long between the rooms with a 4ft door opening. I would like to remove more of the wall and make a 12ft opening. This 2x4 wall runs down the center of the house. My roof has a 5/12 pitch with trusses made of 2x4s. I know I need 1 king stud and two jack studs on each end of this header. What height header would be needed to support the 12 ft distance? Can I get away with 3-2x4x10s or 3-2x4x12s? What is necessary? Thanks.