Thanks for the welcome Asa, and the suggestions! Wagons West sounds familiar, I think there was an old film with that title, not sure if it was based off the books though. I know you said you hadn't read them, but for anyone who has would you be able to say how the Native side of that history is dealt with? I'm of Nez Perce and Walla Walla descent myself so I'm always on the lookout for westerns that might take a shot at dealing with our side of the history, and if the Wagons West series covers events like the white settlement of Oregon I'd be curious to know how it handled that.
Also I'm perfectly open to stuff set up on the Canadian west coast too, the only reason I didn't initially mention it is because I don't know their history as well, so I wouldn't have as much background going in to some historical fiction set there. I'll have a look for some previews or reviews of the books you mentioned.