BFL13 wrote:
Phil, it makes sense to me that a tire at 2/3 of its max will not be under as much strain as a tire at its max holding the same weight up.
In my case with Es at 65, nowhere near their 80 max, IMO I am better off than with Ds at 65-- their max. But I am not an expert, of course.
Your comment about less strain on the tire's structure when inflated less may or may not be the case. Note that with less pressure in any given size of tire, the more it's side walls will flex and hence heat up when traveling. Heat is not good for tires.
My non-expert argument was that a higher Load Range tire will use a stronger construction method and/or use a stronger material. Which means that a higher Load Range tire will fare better no matter how you use it or how you inflate it. I think my reasoning is OK on this because after researching what tires hard core off-roaders use, I notice that their rugged tires always carry high Load Range ratings. However, off-road tires are usually large tires, so maybe higher Load Range ratings automatically follow larger tire sizes.
What I wanted for our RV was the same SIZE tires, but just higher Load Range rated tires of the same size.