I do not know that publishing a list of difficult to access campgrounds would make sense as we are all driving different sized rigs. We also all have different driving skills and comfort zones.
I have met people who would never consider driving off pavement, not even on a well maintained gravel road. I have seen a huge custom fiver and tractor maneuvered into a site that would have been tricky for most drivers.
I think though a list of permanent overhead obstacles might be a good idea. Where we live there are two very old railroad overpasses with very low clearance. One is on a curve to boot. A few years ago someone in a rental moving truck peeled the roof back like a can of sardines forgetting they were driving a tall vehicle.
