Any Information regarding a map system of charge points, would be welcomed.
There is also a great RV park website that lists sites with 50 amp service but I don't recall it at the moment. Maybe someone will chime in with that site.
Here is a site for finding RV Parks;
There are others.
The nice feature of this site is when you go to a city it shows in the upper right of window nearby cities also.
If your trip is coming up soon you may have a problem with many of the parks being closed. This time of year most RVs are either winterized or already south of the freezing line. you definitely want to confirm ahead of time that they will be open.
carstations.com, plugshare.com, and recargo.com are about the best sources. They are owned and operated by EV drivers so they tend to be kept up.
That will be a tough drive this winter as RV parks tend to be closed and the Supercharger network hasn't spanned that route yet. Be sure to call Nissan dealerships to be sure they'll let you charge as many only allow Nissan Leafs to charge.
I have a Nema 14-50 outlet you can use. I get 30mph on my MS. We are about halfway between Chicago and Lincoln. Let me know if you are interested.