I changed from Cooper LTs a few years back to Goodyear Endurance STs. All were same size LR E 16 inch. Curious about the sidewalls after reading so much about them I checked them while they were dismounted. The STs had a noticably thicker and stiffer sidewall.That was with each one dismounted on the floor of the tire shop.The difference was significant.I've run STs and LTs over the years. Can't say that I have noticed any difference in towing. With an Arctic Fox, an Equal-i-zer hitch and a Ram 2500 CTD, I just don't have much sway.