Rustynutz did you book directly through the caravan park or a booking agency if you booked through agency you will not get deposit back
I think it depends on which destination and which agency is used. Some destinations won't offer a refund, whereas some agencies will, and vice versa.
Personally. I use Booking.com more often than not, found them very reliable and now as a regular user, often get a discount. Never had a bad experience, most good and once in NZ an excellent outcome. This was when the destination couldn't process my debit card payment, accused me of providing the wrong number, then sent emails with so much vitriol that I sent them to Booking.com. They settled the matter by bouncing the destination off Booking.com and cancelled my payment altogether because I was a
trusted, reliable member. Good service from my point of view, and reason for me to stay with them.
In the end, what ever floats your boat, horses for courses, etc ...
Just checked with Booking.com, they don't have a refund option with BIG4 Mudgee Holiday Park.