I have a Hensley, have had it since the late nineties, was and is the best investment ever for safe towing, I had a WDH before don't remember what make it was though I had white knuckles a lot then to. The pro-pride is another one you should check out it is less expensive and does the same job.
"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.