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Location: Clinton, MS
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I would not recommend leaving straight water overnight in your cooling system in below freezing temperatures.
Yes, you can plug in the truck's block heater and keep the water from freezing in the block but what of the water in the radiator, hoses, and degas bottle? Those would freeze and rupture possibly. The radiator is not inexpensive and has quite a few plastic elements more easily damaged by the expansion of water during freezing than you might suspect.
There is no circulation without the water pump running unless you have a hydronic heater - if so set the timer for a couple of 1-hour runs late tonight and early tomorrow AM.
The only way to make this work if you are committed to it is to get the truck engine quite warm and then do that again before the temperature falls below freezing until you are prepared to continue the flushing process.
Take precautions if you have started: plug in the block, run the hydronic heater by program or if you don't have one start the truck a couple of times tonight.
Jonathan D. Howell
Lieutenant Colonel, U.S. Army
2005 EarthRoamer XV-LT (Ford F550)
"Americans Travelling America"