How about this as a partial "solution"….I belong to another group whose "expertise" is travel in the west—especially the areas in Montana/Wyoming/Dakotas. It can be found at:
http://www.the-great-outdoors.net/ You need to click on the chat link to get to the chat page..and if you post a question do NOT give your email (it’s not a page with "membership").
Maybe you can use this to arrive at some travel/destination decisions, and once you have a more definate itinerary come back here for food suggestions. The people over there are really helpful and knowledgeable…and there are some terrific pictures. It’s really difficult..at least for me..to offer much help foodwise in such a large area as you plan to travel in. But there are some great places out there!