Slightly off topic, but regarding the tire pressure, I believe for an 80:
P275/70/16 at 32psi
Load index 114, 2480lbs
De-rated for installation on a light truck/suv = capacity of ~2254lbs.
For an LT285/75/16, at 40psi, is rated to 2340lbs. So, a hair under 40psi is a good starting point to then adjust based on personal preference, load, tire model, etc. If an empty vehicle, a bit lower, if a full vehicle, a bit higher. I typically run mine on the road at 42 PSI with the bumpers, skid plate, winch, RTT, etc.
'97 lx450, 170k, factory lockers, ome 850/863, 285's, 4 working doors(1 more than the old fj55 )
'74 project pig (sold