[Richard]

Dario, are you wanting to stay around Glacier or some of the other close by areas?

Look at the itineraries that we have posted by tour year, and you will find a lot of info on parks/phone numbers out in that area.
http://newellgurus.com/showthread.php?tid=6558
http://newellgurus.com/showthread.php?tid=5865
http://newellgurus.com/showthread.php?tid=5301
http://newellgurus.com/showthread.php?tid=4181

There are more in earlier years if you are interested.

I would highly recommend Dick's Campground in Great Falls as a one or two day stay before heading into Glacier. We use it as a grocery stocking, fuel up, take care of stuff before we head into Glacier. You will be more remote than normal, especially if you stay on the East Side.