I've been thinking about changing to a heavier duty tire and I'm considering the Sailun's. My problem is I'm not sure if the wheels on my Pinnacle have the capacity for heavier duty trailer tires. It came with 255/85/r16 Goodyear Endurance. Neither Jayco or Tredit Tire and Wheel, their supplier, could tell me exactly what I have. The wheels are 8 lug and the outside width appears to be about 8 inches. Sailun says their 235/85/r16 S637 needs a rim width of 6.5 inches. Other brands give an acceptable range of rim widths but not Sailun. I would hate to order a set and find they wouldn't work with my wheels. No information is stamped on the outside of the wheels.