I have run both Nitto terra grapplers and Toyo AT2's on my 3500 SRW. Both towing my 5th wheel. The Nittos were great tires, great traction, good in the wet and dry, only issue was they wore pretty quickly, they were down to 7/16 after 25000 miles. They wore very evenly, and were rotated on a regular basis. I changed out to the toyos, last fall, I didn't have them long before ordering a new truck, but the time I had them they wore great, I could tell the difference with them being a harder compound,the ride was stiffer, but they did well in the dry, wet and snow.