I was groundsman at a caravan park on the south coast for 2 years. The park was one of a chain.
People that came in to buy were presented with all the information and rules but most never bothered to read it.
If it's a holiday park it normally closes for around 3 months. That's because you don't pay council tax.....whereas all year round you do. If people try and get around this the site owner is in trouble.
The other condition from the council.....is that the caravan is not your only residence. In many instances this is not the case. People shut up the caravan and go abroad for 3 months....using a friend or a relative as their "pretend home"
In our area,councils have started sending inspectors to these addresses demanding to see the persons room....clothes etc....and charging back council tax.
We only allowed our own gas as many people have little experience of handling gas correctly and that invalidated the site insurance. They also have a tendency to run 20 plug extensions onto a 13amp supply....connecting strings of heaters and wondering where the smoke comes from.
I've been called out late at night and seen several fires.!!
As for banning vans after 15 years, I've been responsible for removing the plywood side covers on many. The vans are built on very thin U chassis and after 15 years....theyre nothing but dust. The interiors still look lovely but they're ready to collapse.
The older vans are made of the same type of cladding as Grenfell. Some sort of insulation clad in aluminium.
I've seen several fires.....believe me....they go up as if covered in petrol and usually destroy or damage any other vans near.
Snatching pairs of 42kg gas bottles away from those flames.....is not for the faint hearted.!!
These are only my observations from my experience. Don't shoot the messenger.