If the "loaded" tongue weight of your Jay Feather 165 Sport (3,500 GVWR) exceeds the "Weight Carrying" limit stamped on your TV's receiver, then yes, a WDH is required and it will greatly enhance your towing experience when properly sized/installed/adjusted.
If your TV/TT combination doesn't require a WDH, I would still recommend installing a standard friction control sway bar.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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