Pulling a 6000# travel trailer behind our 08 WK Hemi.
The OEM Goodyear Fortera's lasted about 40,000 miles. Nice ride, but sucked off road. Trailer was all over the place as well.
Replaced with Cooper Discoverer CTS. Very similar to the Fortera in terms of ride quality and how they pulled the trailer. Only kept on for about 8000 miles as I didn't care for the looks, and again, they sucked off road. Got lucky and the in-laws needed new tires and they were the same size.
Next went to the Cooper Discoverer AT3. Negative impact on the ride and handling, but not terrible. Night and day difference off road - these things love the mud!
Much better at pulling the camper too - not nearly as much rear end sway. Not sure if being wider or a stiffer sidewall is what is helping, but you can tell the difference. I'm at about 45,000 miles on them right now - they might have another 10,000 in them, but I hope to trade up to a 14 before then.