old pop-up axle

well the frame iis stripped bare and the dementions are 73 wide and 64 long. well stretching the frme wont be a problem but it looks like the axle will. i like the width but i want the wheels outside the body. so i ne to wideden the 4 foot axle . problem is it has a tension arch in the middle or a bow . and i dont want to screw up the camber because with nothing on the frame so what should i do i need to widen the axle. i could use some ideas bit the width of the frame is 73 in. i need some opts. tks matt


