Not sure [Tires again]

fj12ryder wrote:
I guess we'll just have to agree to disagree. :) Real world experience vs what the "internet experts" suggest.

I wonder if there are any actual incidences they can point to that were caused by running a "G" rated tire on a 5th wheel at a lower pressure. Or if this is mainly speculation.

My advise comes from actual experience(s).
With five trailers on the road 24/7 and 28 tires on the ground for over eleven years running (some with 2 sets a year worn out) gave me and my drivers first hand experience of the folly of over tiring a trailer and then derating that tire with low pressures.
Lost tread caps/tread separations/blisters from high heat at highway speeds and high rolling resistance were usually the result.

Best long term service will come from a properly fit tire with 10-15 percent reserve capacity to the trailers axle system.
Goodyear tire says it best...

Goodyear Tire and Rubber .... weighing RVs
Special Considerations

Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up