Curious: difference between a WD hitch and Hensley Arrow

I recently replaced my class c with a TT that had a Husky WD. The OP set the WD on my TV and while driving home experienced the swaying when the big rig passed. That decided me to buy a Hensley which eliminated swaying and I don't regret spending the high $$ for piece of mind.

Here's a good video about Hensley.

https://hensleymfg.com/how-does-the-hensley-hitch-work/