This one is "relatively" new (3 years old I think, see the video below).
The goal of this website is to be able to show you the campground you are looking at:
https://www.campgroundviews.com/
I found out about it from
.
Browsing around it for a bit: It doesn't quite have the coverage that RV Park Reviews has (which has been around a lot longer). I checked out some campgrounds local to me and they were listed but a few had no pictures or videos--must not have a lot of coverage yet.
The campgrounds with pictures and videos, however, show quite a bit; easily enough to make a determination if you'd like that campground or not.
Some campgrounds even have 360 videos to get a really good look.