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Most of the time a bad thermostat stays open, meaning full flow. This would only help your situation.
Don't worry about the other guys. Your truck will pull that load and more just fine in those temps once you fix this.
If it appears to be road speed related I would double-check your fan and look for junk in grill or radiator. I got a grocery bag stuck once. Also make sure your fan shroud is functioning.
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