Just adding a datapoint (about half-tons).
I tow a 35 ft Windjammer with my Ram 1500 (5.7L, 3.92 axle, tow-package). I have plenty of power and brakes, but the softer suspension of the half-ton requires a lot more hitch investment.
I tried the Equalizer, but the sway control was inadequate. I tried a typical WDH with two friction sway controllers and it was better, but I still had to be on my toes (so to speak) when semis passed me. (I already owned both hitches for my boats)
I finally bit the bullet and bought a Hensley, and it solved the problem.
For those interested in the numbers:
Truck:
10,150 tow rating
15,100 GCWR
5800 curb weight (CAT scales)
Trailer:
7980 curb weight (CAT scales, full water, no food or luggage)
approx. 900lbs tongue weight (calculated from cat scale axle diffs)
13,780 total weight (truck and trailer)