For 36x12.50/15 Are tehre any Visual Differences in tread and side wall etc? What are differences off road? Also i read the desrciption for tsl and it said strict attention to air pressure when driving on highway, meaning...? what is it suposed to be at etc? Thanks. 6in 87' K5 w/ 35" BFG muds. 305/Sm465/ NP208 Kn, 4.56's. In desperate need of a rebuild. Next- Eaton mech locker... Flows.