I"ve had a Hensley for nearly 20 years now and I can tell you there is no sway period, you will not believe the difference in towing. We have had it on several trailers and had several tow vehicles it's awesome.
"Well that didn't go as expected"
2015 Chev 2500HD Highcountry Duramax
Cedar Creek Silverback 33IK
Donald&Casey cairn terrier
Rest in Peace Mary my darling wife.
Scottish by birth Canadian by time.