I run 75 in mine as I have a heavy triple slide 5th wheel. But here is a note of caution. When i was having my truck serviced the technician rotated the tires and then adjusted the tire pressure. Even though I had the hitch in the truck they didn't think of asking if I was towing at that time. Fortunately I thought about asking if they changed the tire pressure and they then added more air to the rear. I mentioned this to the service manager and he thanked me and said he would advise his techicians to ask the question about towing.