Fifth wheel Travel on I-90 from Montana to seattle

I’m sure I do t know how to use this yet but for all those who replied THANK YOU.
Now I need to know about campgrounds on same route. Are there plenty or at least a few?

My husband wants me to ask about any low tunnels which I’m sure there are non as you wouldn’t have sent us this way. I just want to get off interstate. That’s how we travel mostly and I want to see homes and stuff. Just not interstate stuff