I know that when we go to Big Lake in northern Arizona, there are 4 types of camping.
1) Unimproved Campsites - find a parking spot out in the wild and go. They are usually utilized by tents but I have seen campers (both TC and TT) park. They are also usually a no fire burn policy.
2) Improved Tent Only Campsites - These are by the lake, they have a parking lot where you park the vehicle, then hump your equipment in to the camp site. No vehicle access to these sites.
3) Improved Campsites - These will have a parking pad or pull through of various lengths. You can park a vehicle there (TC or TT) on the pads and camp, or set up a tent. This is more the generic "typical" campsite. There are generally no hookups, but SOME may have a general use water faucet that is for all camp members.
4) RV Loop - Here, I am guessing, as I have never parked here. but from pictures, it looks like it is set up for RV's to park with hookups. Mind you, it also looks like you could reach out and touch your neighbor. If I want that, I would stay at home.
Hope it helps...Good luck and have fun!