Thanks a lot for the good advices.
Two more things:
1. In a German newspaper I read an article on Williston, North Dakota, that wasn't exactly an encouragement to visit this place. However, lookin at the map and following the route as suggested in section 3 of the ACA L&C map there seems to be no way to bypass Williston. Is that so or is there some alternative route?
2. I have always wanted very much to do a train-trip in the USA and now the L&C trail gives me the chance to do this. Since the finishing point of my journey is Pittsburgh, PA, I would like to take Amtrak's "Empire Builder" to Chicago and from there head to Pittsburgh. The most convenient places for me to get aboard would be either Havre, Malta or Glasgow, all Montana. Can anybody suggest, which of these places is the most pleasant (town, surrounding, campgrounds)?
Again I would be grateful for advices, thank you.