Kupper Subaru Share: Dealers Kupper Subaru Visit Website 805 East Main Mandan, ND 58554-7145 (701) 663-8223 About Rep Info Map About Full line Subaru dealer. Four certified Subaru sales consultants available. Full line Subaru and import service department with a Subaru certified technician always on hand. Whom to Contact Bob Kupper What's Nearby? Distance: 5 10 15 20 25 50 mi.