Shame on your NanciL to put 5 psi more in then that " maximum" on the sidewall:W .
Now I was joking, it is allowed even by the stiffer TRA to put 10 psi more then it in for LT and ST tires. for C-load tires and up the maxloadpressure is given on the sidewall and not the maximum pressure.
For Standard load /P tires and XL/reinforced/Extraload though the maximum pressure is given on the sidewall and the pressure needed for the maximum load is respectively 35 and 41 psi.
You are not allowed to go over the maximum cold presssure , but are allowed to go over the pressure needed for the maximum load cold.
But for this topic its probably not needed to go over that maxloadpressure, and you have even enaugh reserves for , pressure-loss in time, incidental little extra load, misreadings of weight and pressure-scales, to high given maximum load of tire, etc , with a lower pressure .