The best answer considering your TPMS is to follow the manual. You could do otherwise and likely not a issue.
There are many variables like: Duals should all be the same diameter so that the wear is the same, the inner dual is usually warmer, the outer dual temperatue is higher with sunshine, typical road crown causes more weight on the inner dual, turning has more effect on the steers, passenger side tires may have different wear, etc. These are likely minor concerns.
I see differences in PSI and temperature during a days travel but the above factors vary throught the day including ambient temperature. For most RVs that pay attention to the tires they age out and should be replaced to lessen any problems.