I use my 2005 Expedition with 3.73 gears and HD tow package to pull my 10k# 20' utility trailer AND my 28.5' long travel trailer. My truck is rated to tow 8,600#. And before anyone asks, NO, I do not fully load my 10k trailer. It was ~$200 difference between a 7k trailer and a 10k trailer, so I purchased more trailer anticipating the (eventual) purchase of a larger truck.
My travel trailer is something about 6,200# wet and loaded.
My Expedition does acceptably, but JUST so.
I got tired of "white knuckling" when a truck passed me, so I purchased a $3,000 Hensley Arrow articulating linkage hitch which did an AMAZING job of removing the truck-induced sway.
In case you aren't aware, the physical principal of PV=MRT dictates that when velocity increases, pressure decreases. This is a large component of what keeps a plane afloat. It is also what happens when a travel trailer is passed by a semi-trailer...the trailers literally get sucked together.
The semi doesn't feel this effect near as much (nor do 5th-wheelers) because the pivot point is over the rear axle. With the behind-the-axle pivot point of a bumper-pull trailer, this action actually "pulls" the ball closer to the semi which "pushes" the nose of the truck AWAY from the semi, forcing the driver to turn TOWARD the semi to compensate. It all happens in a split second and is very disconcerting.
MY POINT: Short wheelbase trucks (Tahoe/Yukon/Sequoia/Expy/Armada) don't handle longer trailers very well.
Before my 28.5' long trailer, I pulled a 21.5' long trailer that pulled pretty well. Of course, it weighed half as much.
If I were you, I'd be looking at a Suburban or Yukon XL. Or I'd make darn certain I was keeping the weights down and factored a top-dollar hitch into the equation. Look at Hensley Arrow or Pro Pride. Both good hitch systems that ELIMINATE sway and make your short wheelbase towing experience safer. No, I'm not a salesman. Just a satisfied user.
MY OPINION, IN CASE YOU WANT TO HEAR IT: Whatever 1/2 ton truck you buy, if you keep camping with the travel trailer you end up with a 3/4 or 1 ton truck. Diesel engines rock.