Travelling through Mt. St. Helens?

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The route it gives is I84, Hood River Bridge, WA14 to Carson

Wind River Rd to Curly Ck to FS90

FS25 to US12 (Randle, Packwood and beyond)

That is my preferred route across this area, but I've just driven it in a SUV. It is all paved. The curves can take logging trucks. So the only question is, do you like curves and grades?

Wind River starts as an easy mountain valley drive. But zoom in and you'll see a twisty section. This is grade to a modest pass. I've stopped there for a rest, and watched motorcycles drive up, turn around and speed back down. Doable in an RV, but more fun on 2 wheels.

Curly Ck rd is a newer cutoff, probably put in after the Monument was established. It has wider curves, and a nice view point of the Mountain.

90 is a major FS road into the mountains from the west. I like to use the Lewis River campground further east.

25 climbs to a another high point somewhat south of the turn off the Mt St Helens. (99?) This is the only access route to the Mtn from the east - to the Windy Ridge viewpoint. I don't think they allow trailer or big RVs on that side road.

Iron Ck is a nice FS campground before 25 reaches US12. US12 is a broad river valley road to Packwood. Beyond that it splits, with 12 continuing over White Pass to Yakima, and 23 going north into the Nat Park.

25 is high enough that it closed by snow into May or June, though I'm sure it's open now.

One alternative is US97 to Yakima, and US12 over White Pass from the east. That's probably just as fast, and easier driving. Scenic in a different way.

The other is west to Portland, I5 to US12. If you haven't seen the Columbia Gorge this is worth the drive, but traffic will be heavier, and over all not as scenic.