Fifth wheel Travel on I-90 from Montana to seattle

Jackielee wrote:
We are planning a trip first of September going out west from Georgia. Wondering about best scenic routes from Billings/ Yellowstone area to Seattle.

And is it difficult travel for 40' fifth wheel

When you really want to avoid the freeways try this:
Work your way up to I-94,west, leave it at Glendive Mt. and go to Circle Mt. and the 200 and 87 to Great Falls Then the 200 again to Missoula and then 12 as directed.