There are a variety of engine heaters, block heaters where a soft plug in the block casting is replaced with electric heating element, tank heaters where the heater hoses are cut and a small "tank" unit with an electrical element is added, which heats the coolant and circulates through the motor via convection, there is a similar unit that can be place in the lower radiator hose, there are also magnetic units that stick to the oil pan and heated dip sticks, both of which don't do much but warm up the oil so the rig cranks over easier. My Power Stroke Diesel has a block heater, I have a Y connector hooked to it and a small trickle charger which is hooked to the batteries and a 50' cord that wraps up on my winch mount. It will fire right up even today and it is now 25 below. The trickle charger keeps the batteries topped up and warm and that really helps, some guys even have little warmers for their batteries.
Loggers often have a set of quick connectors on their crew truck heater hoses. Get to the job and run a set of jumper hoses to a piece of equipment and that circulates hot antifreeze in the equipment motor, they fire that piece up and it goes to another piece as1 does the truck. Soon everything is running. Some equipment and trucks have a propane fired unit that heats the antifreeze.
Some off the buses now have "automatic" chains. A bunch of lengths of chains on the end of a shaft, when engaged the shaft lowers and as it is powered by the drive assembly it matches the axle speed and twirls the chains so they go under the front of the rear tires and spin out the back, one piece of chain after the other is placed under the tire moves with it between tread and ice and then exits to come around for another pass. Genius and expensive. Several of the local school buses here are so equipped. Like I said it is currently minus 25 here. The schools, stores and everything will continue just like they would at 70.
This has been a real mild winter. Right at the end of October there was a snow storm and it dropped down below zero. I was camped in a tent up in the Little Belt Mountains. Went through a bunch of firewood but was comfy. Cut down a couple trees about 18" at the butt, chain them to the truck, drag them down the road and right up close to the tent and saw them up

There were three of us, the youngest was 69 and the oldest was 74. We had a great time.
Mel (74) got stuck in his dually Ford. Rather than chain it up I ran a chain in between his duals and hooked it to a slot in the outside rim. than ran it and another chain back to a tree behind us. When his wheels spun in reverse theY wrapped the chain in between the duals and then sucked the truck back. Then, went forward and that loosed the chain off the tree and as he drove forward it unrolled the chain. Trick I learned from a logger buddy. He did it with both rear semi duals back to the stands on his loaded trailer and sucked his truck straight back under the fifty wheel on almost pure ice.
Mel says he is going to buy a winch and set it up like mine which plugs into a front of rear hitch receiver. The 12 volt outlets also allow me to use my big jumper cables from the front or rear of my truck. One end of my cables has plugs and the other end clamps. 30' of 4 conductor 2 gauge SO cord. 2 used for neg 2 for ***.
I bet plenty of the working guys from here and Wyoming, Idaho and the Dakotas have frozen their fingers a couple times. When it gets down around minus 30 handling metal sucks.