I used to tow a 30' tt with a loaded weight of 7300 lbs and a loaded tongue weight of 1000 lbs. I used the reese dual cam with 1200 lb bars. It was a good hitch but a pain to get set up properly. Info on proper wdh set up.
Some really good wdh Info.
The most important thing is making sure you have your weight in the trailer properly distributed to give you a loaded tongue weight of 13-15% of loaded tt weight. I strongly suggest weighing your current rig. CAT Scale | Network of Certified Truck Scales.
You will want to make 3 passes. First pass is typically $9-12, each additional pass in a 24 hour period is typically $1-3. When weighing have a full tank of fuel, all gear, people and pets like you would when camping.
Pass 1: truck only no trailer. Truck front axle on scale pad 1, truck rear axle on scale pad 2.
Pass 2: truck plus tt no wdh. Truck same as pass one, all tt axles on scale pad 3.
Pass 3: truck plus tt with wdh hooked up. Positioned same as second pass.
What these tell you:
Pass one is used to get your unhitched axle weights. You can also use it to find out some info about your truck. Gcwr - total truck weight =adjusted tow capacity. Gvwr - total truck weight = available payload.
Pass two allows you to calculate total loaded tt weight and loaded tongue weight.
Pass three is used for wdh adjustment. The idea is to return the front axle to as close to unhitched weight as possible without going heavier.