The Gorge is awe inspiring and has lots to see, but ultimately I would choose Rainier. Very limited spots in the park for big rigs, try Ohanapacosh. But there is nothing like Mt Rainier for majesty. You can drive up to Paradise and Sunrise and be ...
Riverside State Park is right in town and is beautiful. Spots 1-14 are hookup spots right on the river. Shielded from most city lights and noise by big bluffs.Another option if you make it a little further is Hood Park in Pasco. A really nice COE ...
That is a really long drive and you may regret it although all of the roads are great and you won't face any traffic to speak of. You won't have much time to see much along the way.
Given the time you have I would drive down to Longview on I-5 and cut over to Astoria on US 30. Arrive late in the day and spend two nights at Fort Stevens SP or Cannon Beach RV. Spend the next full day exploring the north coast before departing ea...