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My F-250 has E rated 8 ply tires . Real stiff sidewalls. So I start at 10lbs. I've been as low as 4lbs. Yep, I was scared of rolling a tire off the rim, but I was more afraid of being stuck in a cut with the incoming tide. I would only go that low again in an emergengy. I haven't rolled a tire yet ( knock wood). 15 lbs with those tires is a real workout for the truck. Low and Slow.
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