I've been reading these posts for a couple of years. We were on our way and had to return for a family medical issue. There's always next year! Everyone be safe this year. I will enjoy reading about your trips.
Here is another suggestion.https://sites.google.com/site/alaskagunshipping/home/how-to-ship-a-handgun-to-alaskaWe're going in 2016 and I think I am going to use Three Bears mail from Butte to Tok.http://threebearsalaska.com
Shotguns, well, with any gun, the penetration depends on the type of ammunition you are using. This is all part of the education that you should get. Even bird shot will penetrate through a trailer wall. Some buck shot (00) will penetrate further ...