[scottz]

There are several options; I don't think any of these require crazy downhills. It depends on what you want to see on the way.

I-80/I-84 to Ogden, Utah, I-84 to Pendleton Oregon, I-82 to Ellensburg, Washington, I-90 to Seattle (shortest route)

or

I-25 to Billings, Montana, I-90 to Seattle area

or

I-70/Hwy 6/I-15 to Grand Junction, Salt Lake, Ogden, I-84 to Pendleton Oregon, I-82 to Ellensburg, Washington, I-90 to Seattle

or

I-80/I-84 to Ogden, Utah, I-15 to Butte Montana, I-90 to Seattle

or

Scenic route I-80/I-84 to Ogden, Utah I-15 to Blackfoot, ID, Hwy 93 up western Idaho to Missoula, Montana, I-90 to Seattle area.

There are other options, but these are the main routes.

I'll let you figure out how to get to Victoria; I'm sure you know the area best. Last time I went, I took the Blackball ferry from Port Angeles.

I have pulled my Montana on all these routes multiple times; no problems. If it is going to be spring, weather should not be a concern. If earlier, weather will dictate which route to use.