The weighbridge said it was 4.45t kitted for touring (full wardrobes etc as well as essential fluids (oil/water/diesel, as well as that in your pic

I fitted BF Goodrich LT radials, and had very few failures - mostly from running over things I couldn't avoid without rearranging the pantry & crockery cupboards! Or colliding with opposing traffic -

Took it up the Outside Track from Innamincka to Birdsville via the Dig Tree (after driving 70-odd km of sharp shale road through the Moonee Gas Field to reach Innamincka, without so much as a scratch on the sidewalls).
I forget what pressures we were running, but it was whatever Goodrich recommended.
Horses for courses... and drive to conditions.