I have run mega yachts for the last 35 years, and getting tired of it (looking for something else to do). My life in the yachting industry involves planning months at a time for yacht owners (short trips, long trips, day trips, sight seeing, restaurants, etc.) There is always plan B and many times C & D due to weather, tides, or owners/guest are just not feeling it. My wife and I have owned and traveled in RV's for over 20 years. Sometimes we do the resorts, sometimes its a state park, sometimes Walmart's. We have covered most of the lower 48 and Alaska.
Still working on yachts so my time is currently limited but I never considered a concierge service for Prevost/motorhomes. Seams it's something right in my playing field. If you would feel comfortable doing it, Private message me your perveances, how long you like to drive each day, do you want to travel every 2nd, 3rd etc day (in other words how long do you want to sit in a specific location)what kind of RV parks are you comfortable with (resorts, ma & pa places, Walmart's etc) and I will suggest an itinerary for you.
You mention Nashville to NYC, and a quick trip. How many days do you have to travel and where (in a perfect world) would you like to end your trip in the NY area.
Don't know if this will work for you but if your up for it I am willing to give it a try. Might be the beginning of something.
Chuck & Katrina
2000 Featherlite
H3-45 Double slide
2014 Jeep Grand Cherokee Diesel