I know some folks on here will automatically jump to "If it's not a blue ox or a Hensley, you shouldn't be on the road." Those are the same folks that also insist to only tow with a 3/4 ton or more.
Now that we have that disclaimer out of the way...
I have a Husky TS (8000 GVW/ 600-800 toungue weight) with about 2000 miles of towing my Surveyor 247BHDS (7000 pounds) with my F150 and have had no issues at all. My parents also use one with their 20' Passport and F150 and have also had no issues.
The Husky TS hitch is a good hitch for the money. Not sure which Equalizer hitch you were using but the Husky TS is very similar to the Equalizer with the 4 point sway control. As the trunnion bars are in place, they also provide sway control going down the road and still allow you to back up your trailer without disengaging.
Do read the user manual and understand how the WDH works and take the time to re-set it up correctly after you get the trailer home and loaded with your gear. I set mine so that the bars are level to the ground and provide enough pressure to push the front of the truck back down to unhitched height.
For a 20' trailer, I wouldn't hesitate to use it.....As long as it's set up properly.
Let me know if you have any questions.
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2017 Forest River Surveyor 247BHDS...
...Tugged by a 2016 F250 XLT FX4 SuperCrew, Shortbed 6.2L, 4wd, 3.73...
...Joined with a Husky Centerline TS 800-1200lbs WDH