gaijin
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@gaijin
I read your post about the source of your RCTIPs and I wanted to take a stab at recalculating mine before I asked you.
2011 LX 570 on P285/50 R20 was stock at 33psi, and I changed to a BFG KO2 in LT275/55 R20 D 115
Using the charts published on Toyo's website, I come up with a RCTIP of 52psi to maintain the 2315lb load rating.
What does the master say?
You need to go back and read page 11 of the Toyo Guide again: P-Metric to LT-Metric.
You need to divide the P-Metric Load Limit of 2315lb by 1.1 to yield a required LT-Metric Load Limit of 2105lb. Look at the charts again for the LT-Metric Load Limit and you will find:
The RCTIP for those LT275/55R20 tires on your LX570 is 46psi F/R.
Now that you've done it once, you should be good to go.
HTH