Minimum door height required for RV storage garage

I would do a minimum of 14' door and figure most mh's are 8 ft wide and most slide outs are at least 3 ft to 3 1/2 ft so that would be 8ft plus 6 ft and you will want a buffer zone of another 3 to 4 ft so you can walk around the outside of the mh to do any work or maintenance on it. get back to the drawing board