DESERT CAPTAIN: When an ad for a campground states: 35' or whatever, that is a 'suggested' length and in the case of national parks, it's an 'average' length of all the campsites in the whole campground. Some sites will be smaller than 35' and some will be longer than 35'. It is definitely not a 'rule'. Having volunteered for national and state parks, we have first-hand knowledge that this is not a rule. Having used public parks as our first choice, we have never found this to be a 'rule'. We got directives from the national/state park supervisors that if someone fits in the site that's fine. Again, we have never seen anyone hanging out into the street. It just wouldn't be allowed and who would want to risk getting plowed into? If you ever see this, then report them.