OP specified not rock crawling. Let's give each other respect of assuming that unless explicitly stated none of us are new to this lifestyle or naive to the variety which exists in how it's enjoyed.
Outside of feature trails which exist essentially for the challenge itself it's difficult to find a legal scenic route anywhere in America that calls for locking differentials, 37's, any of that stuff. I scaled back years ago from what I had been building because of this. These days domestic "overlanding" pretty much consists of touring America's vast array of locked gates and no trespassing signs which is done as easily in a Miata as in a Unimog. When one does find a legal route - again one which is not explicitly a feature trail that's kept open by deliberate stewardship like Rubicon or a component of an OHV park - it typically conforms to the highway transportation standards of the state it's in and will have been graded and widened to permit administrative/fire/resource vehicle travel.
