I have the same tires on 10" rims.
35 psi on the street(heavy truck).
Washboards 15(rides as smooth as the street)
Rocks 12
Snow 2-10 depending on condition/type of snow.

Stan, you really don't have to worry about loosing a bead until you are down below ten psi, unless you happen to hit an obstacle at speed. Reseating a bead is very easy, all you need is an air source. A small compressor and a ratchet strap will do.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed