All I know is that a semi can be a bitch to start at 4am and once you get it started, you'll be lucky it's ready to drive in a half hour.
Also, many trucks have small refridgerators, and/or the cargo is temperature sensitive so the truck HAS to stay running or shit starts to ruin.
I'd say most drivers don't care about the wear on the engine. You can put about a million miles on one of these trucks in less than 10 years, 4-5 hours idling a night isn't doing a whole lot of damage.
It gets pretty hot in a cab during the day, and cold at night. When you're sleeping in the cab every night you need some comfort so...
Is that enough reason to leave the truck running?
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“It is better to be rich and healthy than poor and sick” - Dave Barry
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