is GA dream at all realistic?

A Piper Lance or Cherokee 6/300 would do most of the job. I wouldn't plan on making the Boise trip very often.

Honestly, even with a big fast bird, you're going to need a stop. I personally don't care to go more than about 3.5 hours without a stop to stretch the legs and drain the main vein. Most folks I hang around are about the same, more or less.
 
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