Working on the assumption that this is a holiday static on a holiday park that you want to move from one park to another.
Apart from the fact that you almost certainly won't be able to move it during the lockdown, static parks that accept bring-ons are few and far between.
You may be better to think about selling your current one and buying a replacement when you are able to find a park you like.
Somebody may come along and suggest somewhere, but this is a subject that comes up so often, and it is very rare that anyone ever finds somewhere.
Almost non existent. Sites want to sell you a nice new static.
Loads of threads on here about moving static caravans. Not sure anyone's ever found anywhere, although I think a guy did a few years ago, he said the site wasn't very nice, but when he looked into the transport costs it was a non starter.
Maybe best to ask Willerby - the stands come in small, medium, large and while they are all adjustable to a degree you may need 2 different sizes.
Willerby will also be able to tell you how many you need.
(I assume this is a used van on your own land, as vans on parks are supplied and fitted with stands from new).