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I'm in Spokane but don't fish in Idaho. Some people that I know have trailered boats over to Puget sound. There is a long hill going up after the Columbia(Vantage) that you need a truck that is serious about towing(with a large boat) to get past. There is also about 120 miles of desert to go through and a mountain pass. They usually launch out of Anacortes over there but there are tons of places to launch. If you troll for lake trout and salmon the Couer d Alene, Pend Orielle and Priest are good. Also north of Spokane are Loon and Deer lakes that have lake trout. Some of the public launches might be too shallow to launch a 23' boat, so I would advise taking a look at the launches before heading out if I was you. I don't know anything about Trudeau's.