- Dec 9, 2012
I addressed this in the past. I do not give recommendations for anything over the GVWR of the vehicle.
It is unwise to believe that simply by addressing the tire pressure, one can somehow magically increase the capacities of axles, brakes, shocks, springs, gears, transmission, or any individual component of the suspension and/or drive train.
So, the RCTIP for your hypothetical 2018 LX570 running LT305/55R20/E 121/118S Falken Wildpeak A/T3W tires is 36psi F/R. That is good for all vehicle weights up to and including the GVWR of 7,385 LBS.