For as much detail as you would ever want to know about travel to Alaska, go to the Escapees forum under "travel" then look for the Alaska threads some of which are quite long so make popcorn and read away...
Travel - Escapees Discussion Forum
the forum is for all types of RVing but it really leans 5th Wheel and long term rv'ing enjoy and safe travels, I wish it was us going to AK..
2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio