tow vehicle tires and trailer sway

First I have heard this one too. I can say my D rates handle better than my 14" C rates. As far as sway not noticeable. I eliminated my sway issues very early in my Pod towing experience.

Never heard of that one.  I have had new tires on my 94 F-150 and never experienced sway pulling our 177.  On the other hand we could never travel above 35 mph with our 08 Explorer and NOT have sway.  A sway bar was mandatory on that vehicle.  With our 13 Explorer we have traveled at speeds of 55 mph w/o sway bar and again, no sway noticed.  I did that for a test even in cross winds, otherwise I use the sway bar link.  The only reason i can figure on the difference of the 2 Explorers was the width between the tires.  The newer one was wider, hence better tracking.  As far as pulling with our '95 F 150 with manual transmission my only concern is hitting more deer.  With 320,000 miles it has 31 deer kills, good thing it sits tall and has a real bumper on the front.  Have already hit 3 so far this year, but no kills as far as I know; even though they were pretty well banged up.  Would not want to hit one with the Explorer, with one hit I think it would destroy the vehicle.  Tires on all 3 vehicles above were the standard size that came on them when purchased.