I take your point, and you are technically correct. However I have to say in my experience thats not how it works.
Park home residents tend to stick together and will defend one another, and their right to do what they like in their own homes vigorously. To that end most park home sites have resident committees.
Ive dealt with several park home sites over the years, and the trend is that residents are a very tightly knit group of people with similar values and life styles.
They don't worry about Mrs Bloggs' wooden pagoda and shed within the spacing between park homes being a fire risk. It enhances her well kept garden and makes for pleasant surroundings!
They dont worry about the risk posed by Mr Smiths row of 2 metre high connifers between his park home and the next. Instead they appreciate it because they enhance privacy between homes, and make the place look nice!
They acknowledge the risk but do not want institutionalised parks, they wont something homely, with the ability to place sheds, pagoda, connifers, and other features within their gardens etc.
So I think you should be able to give them the facts, tell them about the risk. Then the park residents committee can decide the best course of action. Half the problem however is that lax landlords have allowed development on the site to go unchecked. And it just seems overburdensome to ask a resident to tear down their nice car port or pagoda or whatever that has been there for 20 odd years! It is afterall their home.