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I agree that running full max when carrying a much lighter load is not necessary and could cause premature center wear. What I am unsure of is just how much less air is acceptable to the manufacturer. I do know with automobiles the listed PSI inside the door is the only pressure they want you to go by at all times. My F-250 Diesel said 80 PSI but I always ran them at between 65-70 for a more comfortable ride unless I had a full load behind me.

I don't know Cliff but it sure seems an 8 ply tire rated for 100 PSI under a 13 foot whaler is a bit stiff. My Montauk trailer is bigger than it needs to be and the Duro Tires are rated as 4 ply tread, 2 ply side walls 1360 pounds at 50 PSI.