Get Out your wallet!
My list of "Must Haves" for travel trailer camping:
Weight distribution hitch
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.
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Portable waste hauler if you are camping for several days in a site with no sewer connection and the campground has a nearby dump station
That's quite a comprehensive list there, Texas Sam. But you forgot one extremely important item that should have been the very first item on your list...
M O N E Y... and lots of it!
A new RV can be (What do I mean, "can be"?)
IS a real money pit. And, if it's your first (which I believe it is since you're asking about selecting a hitch and brake controller), it will be a lot like furnishing a second home.
So, besides what Texas Sam has already listed, you're also going to need:
dishes, pots, pans. bowls. silverware, glassware, mugs, kitchen utensils, coffee maker, toaster, colander, hot pads, bathroom items (like hair dryer, toiletries, ice bag, heating pad), towels, linens, blankets, waste baskets, cleaning products, vacuum cleaner, broom, dustpan, bucket, sponge, lawn chairs, outdoor rug, doormat, personal items, plastic baskets or containers for small items, clock, indoor/outdoor thermometer, a good book on survival (because out in wilds, you never know, and help might not be immediately forthcoming), electric heater, nite lights, carbon monoxide detector (if your new TT isn't already equipped with one)... I know there's much more but I'll stop here.