Re: air pressure in 31x10.50s
I run 65~70 psi in mine, dropping down to the mid to upper 20s off road. But I'm running metric tires, so it's not quite the size you asked for.
2000 XLT 4x4, 4dr ext cab, 4.0L OHV, 4.10 LSD
265/75/16 Goodyear Duratracs
Mountaineer seats, Expo OHC
2003 EDGE front clip conversion
1969 Mercury Cougar
351W, FMX, 3:1 open diff in a Ford 9"