[tentcamper]

I don't know about inside the trailer. But empirical knowledge tells me there is a difference. I do know with my Van, when I increasing the tire PSI from 36 to 40 there is a noticeable difference in the harshness of the ride. To quote my DW the first time we took a trip with the tire PSI up by 4 PSI. "What did you do to the van, it rides like a truck?" I would think 15 or 20 PSI higher it would be much more hash.

That is why I follow the engineering spec's by the GY engineers with the endurance ST tire load to PSI chart. See my above post. But I do add 10 PSI for speed. Bring them up to 65 PSI for the load range E 225x75x15 endurance's. My tire shop agreed with my use of the GY chart and my calculations using the chart, which they had GY chart at their shop.

But I would error on the high side when using the chart. Never wore out a set of trailer tires, so a little more wear in the center is no big deal.