Buffalo, NY to Seattle and back suggestions

A previous poster suggested leaving your fur friends at home. That's a good suggestion. I know being separated for 6 weeks could be an ordeal for your family as well as the pup and kitty. And the kitty would probably be ok with being alone in the trailer while you're touring around. However, your doggie will limit where you can go and what you can see. The National Parks are not dog friendly. In most, they are not allowed on any trails, and are usually limited to parking lots on a 6 foot leash. As the past human to 2 wonderful Weimaraners, we had to plan on staying and hiking in USFS areas rather than NPs, which impacts touring plans. IF you can find a private CG or RV Park that has pet sitting, in the areas you'll explore, that would be a wonderful alternative...IF you can find them.