Coming around from the south, and this is old info , it's been 12 years since I've been around the parks . Avoid Montana 49, it is a shorter route than going through Browning, from East Glacier Village, but, after the turn off to ; Two Medicine camp ground; the last 5 miles is marked no trailers.
For very good reasons.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.