I respect what you are planning, however I think you are planning way to much in a short period of time. When I plan trips I take the day drive night plus 2 nights as a min. That gives time to relax and really see the sights. Your list has way to many things you plan on doing. The 1880 train is a full day, badlands and wall drug at least two days. Its not like you are going to get up and get everybody starting a 6 in the morning. I would bet you would not get started much before 10 to see the sights. Oh how long do you plan on leaving your dogs in the camper!! I find 6 hrs for mine is ok 8 is a stretch. So that cuts into your sight seeing time. Just way to much going on, slow down cut this trip into two adventures I think you will be happier.