Like said, never an issue with Central Dispatch if conditions went to heck. Guess it was reputation of willing to run, especially weekends and all regions. Best one ever, called prior to going to motel and plugging tractor in. "Heh, it's -30 and will be around -45 by morning, tractor's not going to start if not able to idle, just letting you know" Sure as heck, fuel fine, everything else froze solid, Road Rescue, towed to heated shop and 9 hours later, I can go trucking. Locals shook head at non idling tractors. Terminal had either idling tractors, or tarps and portable heaters. Gotta be aware of your conditions. If your dispatch/management lives where only a few days below freezing a year, can't comprehend, don't take it personal, try to pass on knowledge, and how national policy effects your operating and added extreme long term costs. Always had authority to make assigned tractor idle after that in winter. Some who go everywhere, never know where will end up.