I've traveled all over the east coast on business, staying in government (public) parks probably 95% of the time. Based purely on my observation it appears that 32-34' is a reasonable size. I've been in some parks where access roads alone would hinder longer units. I've also been in parks that would accommodate larger units, however the number of large sites were few. I'll be looking for a 5er for retirement in the next few months and due to my preference for government parks, that's the way I plan to go.
Most public parks I've visited in the east have had a 2 week stay limit. A few have allowed a month. While one permitted an unlimited stay during the off-season. However, one would have to rotate (move) every two weeks into a different section of the park.
