We live west of Reading,Pa and were there in May 2016. May and September are the best months.Nice weather and fewer people.Yes, you will have fewer choices for campsites,but that's ok. We stayed at Madison. No hookups but you can run your generator during certain hours. If you don;t have 2 batteries,I would add another one. Madison is centrally located. We were there 4 days,but should have had 2 more. Some highlights were the Grand Canyon of the Yellowstone,seeing a grizzly mom with 3 cubs and eating in the Inn at Old Faithful. The lobby is beautiful.If you want more info on routes and campgrounds along the way,message me.