I have those on my truck camper. My rig is around 7200 pounds rear axle and 5300 front axle. I run 90psi on the rear and 70 on the front. I've only got around 15,000 miles on them though. I rotate them every 5,000 miles and they are rebalanced at at that time. (Les Schwab was where I bought them and it's included with the purchase.) I rarely drive over 65mph and usually 60mph on highway as I either tow my Suzuki Samurai or a small boat trailer.
I like the sound of the tires on the road. Makes me feel like a real 'trucker'. Ha! But with the windows up, I don't hear them, so it's all good.