Originally Posted by avolnek
It is a generalized notion that P rated tires are a contributor to sway because it is a fact!.
With apologies to the OP.
Many light trucks and SUVs come equipped with P-Metric tires and just as many of these vehicles roll off their respective assembly lines with significant towing capacities. If there is factual data to demonstrate that these tires contribute to trailer sway, would it not be prudent for the vehicle manufacturers and especially the tire manufacturers, to include warnings with their products? I'm not aware of any such warnings. Has controlled testing been conducted to validate the claims that P-Metric tires on light trucks and SUVs contribute to trailer sway and are therefore unsafe? If so, I'm not aware that any such testing has been carried out. Summarily, if in fact P-Metric tires contribute to trailer sway in a half-ton pickup or SUV capable of towing 8,000 lbs, shouldn't the RV community be campaigning the national transportation authorities and vehicle/tire manufacturers to end the unsafe practice of installing P-Metric tires on the aforementioned vehicles?
Alas, I think I smell a red herring...