If the parks would be more accurate in their site descriptions, it would solve a lot of problems and people would not be tempted to "shrink" their coaches. I was in a county park in VA last month which had numerous sites that were restricted to 35 feet or less, but had enough room for a 45 footer or even a 50 footer if there were such a thing. This is not uncommon.
It seems that many campgrounds base their length limits on the paved site length area without allowing anything for the rear overhang on these coaches. Unless there is an obstacle behind the site, a coach with its rear wheels on the pavement can overhang the pavement by many feet.