^Thats because I have no idea what the recommendation is! Never used a wdh yet for any trailer behind any truck I’ve been behind the wheel of. (To be fair I did try to hook my toyhauler to my 1500 Chevy with the previous owners wdh he gave me with the trailer. It didn’t help that poor little truck much…)
As far as my opinion on it goes. “IF” I needed one to help out my suspension, I would likely just go by how it felt, driving, with respect to understeer and what it took to get the back of the truck up to an acceptable level of sag.