Yup, after speaking with parks and rec in Bentonville, they do not have any RV or campground accommodations anywhere in town or even nearer than 10 miles away.
So it's rent a car, get a toad, or cancel trip.
I spoke with Crystal Bridges Museum and expressed my dismay that they did not even plan to accommodate motorhomes for those that are traveling from out of state. They have definitely limited who can make it there and who wants to plan it as a destination.
Oh well.
Thanks!