<OP The chalk test interested me...that's why i tryed it. Even at 16 psi the chalk thru the center was worn off and the chalk on the outsides was worn, but not like the center, so i would guess that to get "the full contact" it would have been somewhere around 12 psi. I searched the forum for more info and didnt get a whole lot, thus i started this thread, if for nothing more than another post for noobs like myself that didn't know a whole lot about where they should sit with the air pressures. I would have no problem at all running 12 psi on the trail...i currently sit at 24 psi and its comfortable for me and my very stock TJ with no weight from aftermarket bumpers, spare tire and i have a soft top. One day when i have all that stuff then yeah, i may run another 2-4 psi....
Again, Thank you all for the imputs...more info here, less mistakes out there! lol