Originally Posted by DocBrown
Here's what my manual says about proper inflation:
The recommended cold tire inﬂation pressure, shown on the label, is the minimum amount of air pressure needed to support your vehicle’s maximum load carrying capacity.
No where does my manual say that you should not inflate the tires beyond what the door sticker says. The above statement infers that you can certainly increase the PSI to better support the load. And personal experience in 20+ years of towing says yes, the towing experience is dramatically improved by increasing the PSI on my rear tires.
That said I run my rear tires at 48 PSI when towing.
When not towing I run the tires at the pressure recommend on the door sticker.
I agree with you nowhere they say that you cannot.....nor that you have to.
Yes its a recommendation I would say based on scientific evidence, not on the flavor of the month.
For the best overall performance and durability its the pressure on the placard.
Higher pressure might help a P rated tire, but IMHO a truck should not come with car tires, I would guess that many of the squirrily truck behavior report comes from this type of tires.
Now how much to add for as you say.... a better support... for the weight added to the truck ? A bit ? a bit more ? Much more ?
How much is too much ? At what point are we going to ride on a skateboard ? At what point are we going to wear out the center of the tread prematurely ? Since the tire ride at higher pressure at what pressure are we going to add additional stress to the suspension ?
Its to the driver to decide for his
application and its approximate and subjective, with no scientific base.
The placard is the one fits all solution, a safe one , done by professional any other suggestion is an opinion...
Im not saying that the peoples increasing the pressure are doing something wrong, Im just saying that its wrong to become a Monday morning engineer and promoting our own truth.
Doc Brown do not take me wrong I' m not saying that is what your doing , im talking in general , and I always like a good debate :-)
Thanks God we live in a free world