Which Hitch do I buy?

I wouldn't buy anything with that truck and Trailer other than a drawbar and ball. Drop it on the ball and go. I bet you would be hard pressed to find a contractor anywhere, hauling equipment on a trailer with the same model truck, that weighs a lot more using a WDH. He'll be using a pintle.

I started with the Equal-i-zer 4 point rated at 1,200 lbs for my 7,800 lbs GVWR trailer. The square receiver for one of the bars cracked after 6 years. I upgraded to the 1,400 lbs Equal-i-zer and it works fine with a margin for a heavier trailer. Using gross rule-of-thumb numbers, tongue weight of your trailer at 15% is 1,050 lbs. You would need the 1,200 at a minimum. I recommend the 1,400.

I have had many years of success hard towing my 28 foot 5000lb R-Vision Trail cruiser in Rockies and western mountains using a Equalizer WDH that is easy to setup with no chains except safety chains of course. Has the square anti sway bars instead of the chains connected to sway bars.

Angle and height of the hitch ball is very adjustable.

I like my Husky Centerline TS with 1200 lb when towing a 10k car hauler with a 7400 lb blue tractor. The tractor on the trailer is right at 11' 10" tall....very top heavy load. Real pleased with the hitch. Tracks the truck like my GN and 5th wheel trailers now.