I calculated with my made pressure/temperature calculator that temperature of gascompound in tire was round 100 degr F at that moment.
That is pretty low, even for driving in 70 degrF speed of 50 mph, and you had it in 75 degr and most likely higger speed.
So this suspects the deflection of tires being minimal. So my carefull conclusion is, that pressure can be lower.
But to know what pressure you can use, we have to have more details.
Best is determining axleloads or axle-end loads by weighing fully loaded as going on trip, so also the persons.
Then I can make a pressure/axleload or axle-end list for your tires, with build in max reserve, but still acceptable comfort and grip.
Then you "ONLY" have to determine the axle or axle-end load 99% acurate, the most tricky part, and your responsibility. Search that back in my list, and you have a safe pressure.
Then you dont need to do pre-calculations, like adding reserve or deviding by 2 or 4.
Need next from tires.
1. Maximum load or loadindex
2. Loadrange or plyrating to determine the maxloadpressure, but there are exeptions, so if you see AT xxx psi, thst is what I need.
3. Speedcode and if ST.
Nice also are sizes, and GAWR's and GVWR, empty weight, dualload axle behind
Dont go lowering in the blind, you risk going to low and overheat your tires material
This overheating is only allowed ZERO times in tires use, and can give tire failure sometimes after 3 years, when damage has build up enaugh.
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