As an FYI to anyone contemplating a trip like this...I highly recommend contacting Gary Pruitt of Bon Voyage Snowmobile Adventures. Gary and his crew are true professionals and will give you the experience of a lifetime!
For what Bon Voyage offers you cannot do it on your own for the same price. I tried! Don't ask me how Gary does it, but he does and I cannot say enough good about him. Below is his web site link....
http://www.bvsnowadventures.com
Dan