If you use Facebook, can I point you in the direction of The Holiday Park Action Group? You will need to join the group to read, as they screen out park owners so that caravan owners are not victimised for posting anything negative.
Caravans and lodges are part of an unregulated industry, and people lose tens of thousands of pounds every day. You can easily pay well upwards of £75,000 for a new 'lodge' (basically a glorified caravan) and the resale value is much lower. Contracts often say that you have to sell back to the site, and they will offer you £10,000 - £15,000 after just a couple of years - it's not depreciation, it's a racket, as they will sell your almost new caravan for £60,000 to the next buyer, making another massive profit. Most of the site owners' profit comes from 'churn' (getting rid of existing owners to replace them with new ones) and they use all sorts of dirty tricks to make this happen.
You usually have to have all works (eg decking, wifi installation) done through the park, and buy things like gas from them, and they add fees to the price paid to the contractors - an average of 30%.
Rules can change year on year, so what you are told when you buy are not necessarily what will apply down the line (eg people with two dogs might find that only one is allowed, and have to sell back their caravan or get rid of a pet). Site fees can also go up massively, often to pay for 'improvements' to the park, which benefits the park owners, not the caravan owners.
Don't believe that buying on a small private park will protect you - they often change hands overnight, eg when a park owner retires, and you can very easily find that you are working with very different terms and conditions.
The group I mentioned are campaigning for regulation in the industry, and I believe that they will succeed, but until they do, buying is a huge risk, and the group don't recommend that anyone buys a static caravan or a lodge, but instead gets a tourer that can be removed from the park and taken elsewhere, and can be sold to any buyer at a fair price. Either that, or rent a caravan for holidays and save your money.
Sorry to spoil your dream, but it could easily turn out to be nightmare, as I know from experience.