The sidewall only tells you what the max is for the tire, not what the right pressure for your truck is. I asked a similar question a while back after having a set of tires wear out too fast and ride too rough, which was because of overinflation. What was suggested to me was to make a mark on the tread from side to side with chalk and then drive enough for the chalk to wear off. If the chalk only wears off the inner tread, then there's too much air. If it wears off the outer tread, the tires are probably underinflated. Basically you want the entire tread width to make equal contact with the ground. You're probably running a little too much air. I have 33's on my '98 Ram and I'm running 26 psi up front and 24 in back for my tread to touch the ground evenly. I've put about 1000 miles on my SSR's after checking it this way and there's is hardly any tread wear, unlike the tires these replaced, which had noticeable wear well before then, all because they were overinflated.
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