Ride quality with W/D Hitch

Wdh and sway control are two different things unless you get a wdh with integrated sway control (Reese dual cam, equal-i-zer etc). Wdh is used to redistribute the weight back to the front axle when the weight on the hitch has caused the front of the truck to rise creating you to be too light in the front and lose steering capabilities. Most vehicles tell you in the manual at what weight they require a wdh. I would not be surprised if yours is somewhere in the neighborhood of 500 lbs. With a tt gvwr of 3500 lbs you could potentially be at that Mark (ideal tongue weight is 13-15% of loaded weight). 13-15% of 3500 lbs is 455- 525 lbs. You could get o be for piece of mind or go get a sherline tongue scale and measure your tongue weight for a definitive answer. If it were me and I was close go that line I would get one.

Sway control is used to help maintain control and eliminate a sway condition (you still need to properly load etc) think of sway control as a back up safety device as you shouldn't have sway to begin with but it will help prevent it. A wdh with integrated sway control does both jobs. This is probably overkill for your trailer. You should be fine with a wdh and a simple sway bar.