I'd worry about the automatic tranny more than the engine--especially with a DT360, an 8000lb trailer, & mountains...you're probably gonna cook something unless you make some changes. I'd do the water spray on the biggest tranny cooler I could find (like, the size of the radiator), maybe throw some ice in the water tank, run a trans temp gauge & watch it like a hawk. Above 150, back off the pedal. Above 160, start looking for a place to stop. Above 170, stop & fast-ldle in neutral until it cools down. DO NOT SHUT DOWN, because the heat will have noplace to go, & the ATF will bake.
An engine will run cooler revving high than it will lugging.
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Jarlaxle
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Optimism is a mental disorder.
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