Just a couple weeks ago we did some scenic routes through western Montana . I'll have to post a few pics for you. Had a great time. There were a number of low key campgrounds or boondocking opportunities. Here's some info:
This website was extremely helpful for our trip to montana. !!!
http://www.bigskyfishing.com/scenic-drives/index.php
The Routes we took were, in order:
The Southern Rocky Mountain Front Scenic Drive
The Anaconda-Pintler Scenic Route
The Mt. Haggin Scenic Drive
The Big Hole Valley & River Scenic Drive
The Pioneer Mountains Scenic Byway
We wanted to do the Gravelly backcountry route but ran out of time.