I suggest that you go to yellowstonepark.com website, read the info they have there on campgrounds, then telephone them for your reservations, and ask your specific questons.
It's very easy to make a reservation, assuming there are still some sites available. This can be rather late to make reservations for some weeks in the peak season, but you may still be okay for the end of June.
I've never stayed in Norris; it wouldn't be my choice for trailer camping, since it's somewhat of the beaten path unless there's something specifically there that you want to do in the area.
My personal choice of Park campgrounds is Grants Village, and I'm pretty sure they have sites big enough for your trailer, although I've just tented there, in a normal tent and in a popup tent camper.
I've also stayed in Madison, but also just in a tent, so I can't say for sure that they have a dump station, but I'm almost certain they do, and if they do, the others that take reservations would also. Ask when you call for your reservations.
If you do stay at one of the campgrounds that are on a first come first serve (as I believe Norris would be) make sure you get there early in the morning so you have a shot at getting a site. The earlier, the better. A lot of them can get filled for the day by mid-morning, and it's no fun at all driving the rest of the day in heavy traffic trying to find another place to stay.
John
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Flyfisher
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