One company that comes highly rated (Nick Russell, Gypsy Journal Newspaper Editor) and has very good prices is Phoenix Commercial Paint, Inc near Elkhart, Indiana:
http://phoenixpaintinc.com/default.aspxYou will have to move out of your coach if it is complete paint job (3 to 4 weeks is the approximate time). So you would have to find a place to stay. This is, however, pretty standard with any complete repainting job. They also will repaint just some areas of you coach and not all of your coach.
So if you need some painting done on your coach please check Phoenix Commercial Paint.