It depends. If a pull through and I have no need to use my towed vehicle, I'll just pull through.
But more often, in the public campgrounds I use, the sites are back-in. So I'll find some wide area or parking area between the entrance and the site, disconnect the tow there, park it, and go on to my campsite. Once set up, I'll walk back to my towed vehicle, and bring it to the campsite if there is room, or leave it in overflow parking it not.
I've been in several commercial RV parks where the place I would do this separation, and park my towed vehicle, is outside the campground.
You do what you have to do, as the situation requires.
