Tire pressure

[Roadtoaster]

I posted this question in response to another post. Since it did not get a response and was somewhat off topic to the original post, thought I would give it another shot as I'm interested in knowing more.

AS says inflate the Marathons to their maximum 65 lbs. The tire placard on my truck says 53 lbs front and 80 lbs rear. When hitched, my rear weighs about the same as the front when not hitched, yet the fronts are ok at 53 lbs. The Goodyear site says inflate based on known loading.

So, why are we maxing out pressures? Is the truck/trailer more stable because the sidewall is stiffer; is there less heat produced for the same reason? One thing is for sure, more pressure means a much harsher ride in the truck and for the trailer. Anyone out there running pressures based on load? Are lower pressures more/less prone to failure?

Thanks

Greg