Well, do you have an idea how much your pathy weighs ready to go? At first glance the tires you are running are more than enough. 2600 lbs per tire more than covers the stock weight of 4859lbs (06 LE 4wd, YMMV). But where you get into the grey area's are psi's and sidewall strength. Those tires are prob built for a max of 35psi. When fully loaded you might want a little less tire squirm and less body roll and 40 or 45 psi might make for a better ride. But with that tire you can't, safely, run that high. But with XL's or other D range or E's you can.
Find the manu pub'd curb weight and scale out your rig in full camping trim and go from there. Otherwise its all speculation.