Since we got kids, most of my RV park experience is for places that cater to them (i.e. KOAs, Jellystones, etc...). If you're going to end up in one of those places here's a few tips:
1) Kids: They're everywhere. No, really, everywhere! You have to be on high alert when driving through the campground. I've had kids ride their bikes up beside me and cut me off by like a foot. You'll need to drive slower than you can walk.
2) Your site isn't your site. As much as you'd like to stake your claim, it's gonna happen, somebody will cut through your site. Most will just be skirting the perimeter though.
3) Unlike state parks, these places pack you in. Don't expect peace and quiet, you will hear your neighbours. The upside to being packed in though is that it's less likely to have anything stolen. Nobody wants to steal something that's in plain view of somebody else.
4) Don't worry about a hitch lock, nobodies going to hook up and take off with your rig. However, having a lock in general is probably a good idea. If you're used to wilderness camping I think that's a more likely spot for you to require one.
5) The lineups at the dump stations only occur on Sunday, unless it's a holiday weekend, then they occur on the holiday. If your plans are flexible, don't checkout on those days. Your other option is to go with a full hookup site. Price difference is generally only a few bucks more a night. If you have to checkout and there is a lineup, just take it with you and dump at the next campground.
6) Leave the generator put away since that is a kind item that might grow legs at 3am when nobodies watching. You'll be using the park's power so it's not like you'll need it anyways.
7) Speaking of the park's power, yes, you don't always need a surge protector, but the point of them is that you don't know when you might need one. I did my first year of camping without one and I was fine. My first trip out this year the park was experiencing brownouts during a storm and I was noticing it's affects. Scared me enough to go get one after that trip.
8) Adapters. They're cheap. Under $10 at Walmart. It'll cost your more to fill your propane than it will to get a set of them. While you can expect most parks to have 30A, you can't always expect the 30A to be in great shape. I've had to plug into the 50A sometimes. (once because somebody else was already using the 30A, it was a shared pedestal with the pull through as the end of the road. The other times the 30A was loose, didn't have power, didn't trust the CB with the screw driven in, melted, etc...)
9) Privacy: Don't expect any. If you're used to hoping out of your trailer in your roos to visit a tree, untangle the dog or whatnot, you might need to curb that behaviour.
10) Don't Worry, Be Happy! Just go and have fun. Most situations you can get over easily. The partiers up all night? Either join them, or shrug it off. You'll be gone soon anyways right? The screaming kids? Send your kids to play with them. Suddenly it doesn't seem as noisy. It's all about having a fun, relaxing time so if it seems like your getting stressed, just remember that stress is all in the eye of the beholder.