Requires the "max utility pkg". Don't buy the truck without it. Even then you have to pay attention if you don't want to be overloaded with an 8,500 pound TT.
2012 Titan SV trim 4x4 long bed CrewCab with max utility pkg has payload rating of 1,644 pounds and tow rating of 9,100 pounds. At first glance that sounds like enough for an 8,500 pound trailer with up to 1,275 pounds hitch weight. But it's probably true only if there is absolutely nothing in the truck but a skinny driver. Load the family and toolbox and "stuff" that's normally in the truck, plus the shank and ball mount for your load-distributing hitch, plus a full tank of gas, and both the available payload for hitch weight and available towing capacity goes downhill in a hurry. Note with 9,100 pounds tow rating, if you put more than 600 pounds worth of people and stuff in the truck you'll be overloaded over the 8,500 pounds tow rating. And if you have 15% hitch weight, that leaves only 370 pounds for people, stuff, hitch and gas.
Click on the following link, then scroll down to the bottom to see the weight capacities of the various configurations of the Titan pickups. But understand that those weight capacities are the MAXIMUM
weights that are available only with an empty truck with nothing in it but a skinny driver.
2012 Nissan Titan Crew Cab | Nissan USA
So even if you are careful in loading the rig, with an 8,500 pound trailer you'll probably be right up against the weight ratings of the tow vehicle. The Titan would probably do it, but it won't be happy doing it, and you'll probably have no wiggle room for adding weight in the truck. You'll struggle over mountain passes and other long grades.
So my conclusion? Even when properly equipped with the max utility pkg, the Titan is not quite enough truck for towing an 8,500 pound trailer over hill and dale. I'd move up to a 3/4-ton pickup, and I don't think Nissan sells one in the USA.