All good advice. You probably will not be spending much time other than sleeping in the RV because there is so much to do and see on this trip to Alaska. So, with regard to size of the RV, smaller is better. Easier and more economical to haul. Easier to get around with and park in smaller spaces.
Take a small portable grill so you can do most of your cooking outside. Be conscious of the wildlife for they can be amble in places. If your planning a one month trip and your finances allow more, double the length of your trip. You won't be disappointed.
Enjoy your trip. Leave the need to rush in the lower 48, relax, have fun, and soak up the beauty all around you.
Lakeside