Alrighty. here I go. I`ve got a question about a good air pressure to run in the 20`s that I have on the 1983 C10. size-- 275/40R20`s rear, 245/45R20`s on the front. I`ve been running 35psi but they seem a little soft when I hit a bump, it`s Louisianna the roads suck. My question is would a...