Route from Kalispell to Gardiner

I would go U.S.93 to left Mt 82, right Mt 35, left Mt 83 also known as The Swan which is a beautiful drive, left Mt 200, right MT. 141, right U.S. 12 left I-90, right U.S 89 into Gardiner. The only part between Kalispell and I-90 I haven't pulled many times either with a 30 ft 5er or 38 ft car bp trailer is U.S. 141 and U.S. 12