The walk from room temperature to 20° - 30° is a big one and cold on warm surfaces will give condensation.
Put your camera, bag and loaded film, lenses, etc in a blanket, set it outside, bundled up, set it in your cold car, garage or out building and wait about six hours for the cameras, etc to cool down to the outside ambient temperature, the blanket will allow a slow cooling, no condensation to speak of and doesn't cause a 'shock effect' to the kit and systems.
With gloves on, I like wool shooters gloves, with a half mit, and finger tips uncovered when folded back, go out, allow them to cool in a minute or two before handling your camera kit and taking photographs.
If you're in a safe area and plan on more shooting in the day or tomorrow, just re-stow your kit in the blanket and cold, so it's ready when you are.
Clean clean trunks are just as good for hiding away kit, as it interior of a car or truck.
When it's time to bring it all inside, keep it in your dry, blanket, put it somewhere away from heaters and allow it hours to warm black up, with no 'fogging' of plastic, metal, glass.
This is what I've done in the past, and other than a roll of brittle, tearing film, I've have had no issues with gear being used in the cold.