Visit the Alaska Forum here. Check out the Roll call 2014 thread - those are all people going to Alaska this year. Check out roll call 2013 for information from last year's trip.
1. We have no reservations. We will probably make some a week or two ahead for Denali.
2.The ferry is much more expensive but the view is different.
3. Thousands of people have RVed to Alaska and I haven't really heard of any crime spree against RVers. My guess is that you are as safe as you are in the lower 48. If you worry at home, you'll worry on the road. Personally, I live in the city and I don't even always lock my doors; I just don't worry about it.
4. Since you spend a lot of time on the road, you have a lot of access to grocery stores. It isn't like you have to stock up to get through the winter.
5. When the trip gets closer, the nausea will grow and your voice will be hoarse from shouting. We are leaving in 3 days. I'm a little panicked, but happy.
6. To relax and have a good time. Read and join in the Alaska forums - there is a lot of good advice there.