We had 2 fantastic weeks with 5 layovers between Prince Rupert and Haines starting May 17 last year. Although we had only 22 feet of truck camper, a crew member would still tell me which way to turn the steering wheel when backing up. I never saw any of the big rigs have to go forward and give backing up another try. Don't worry about backing up! It's a piece of cake with the crew's help!!
Another hint I'll always give: Spend enough time in Sitka if you go there. We had 4 nights. It was our favorite town in our total of 8 weeks in AK and Canada.