Moving audio gear in sub zero temperatures

They should be fine, but when you bring it inside, leave it off for 24 hours to ensure any condensation clears first.

Also, what about records and plasma tv's?

I found this:

Samsung Plasma TVs can be stored at temperatures ranging from -4 °F to 113 °F (-20 °C to 45 °C). Storing a Samsung Plasma TV in an environment with temperatures outside this temperature range can damage the TV, even if it's not in use.

And this:

Cold temperatures will do no damage to plasma TVs until they dip below freezing. The cold itself doesn't hurt a TV, which is why it can be transported and stored in freezing temperatures. But if you take a cold TV indoors and immediately turn it on, its electronic components can suffer irreversible damage.

Oh, and don’t slip on the ice and drop it.

Properly boxed up the inside temperature is going to be higher than ambient. 

I have a bunch of stuff that was submerged in liquid nitrogen for a week. So no, I don't think overnight in a car is a problem.

OK Think about what you're putting your beloved equipment in to transport it.. I assure you that, the transportation device your using, has about 10 time the electronics and at least 10 X again in leading edge tech.. You're worried about your gear.. I'd worry about the transportation device FIRST.. LOL  Cold weather and gear.. Dream come true.. Not gonna hurt a thing.

I've seen equipment bounce from one side of Canada to the other in the dead of winter.. Just transported in a regular cargo trailer.. The tractor pulling the trailer is what I'd be worried about.. LOL..

A desert crossing.. YES I'd be worried... Plastic warping all kinds of things happen in the desert.. 

I've fixed equipment in both.. I'll take the cold, when it comes to equipment breaking.. You might get cold.. But the equipment doesn't really care. Keep it dry, and don't let it rattle all the way THERE....
Lots of moving blankets, ay! Tuck your babies in...

Regards

Thanks for the replies. What about records?

The idea of leaving a piece of gear to reach room temperature after being in the cold prior to running it is a good idea.  

Frank Van Alstine from Minnesota used to joke, "If you order from us in January you get FREE cryo-treating of your gear during transport." The electronics and LP's should be fine. Aside from mitch2's caution on the temps and the plasma.

What about records?

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Tight is right, simple. Make sure things are secure in case of heavy breaking or worse.. You don’t want equipment and records flying around in the event of, something happening.. Going off the road, getting bumped.. la te da.. not too bad.. Equipment in the back of your head is something different.. No tools in the CAB... just a rule of mine.. Gun, pepper spray maybe, no heavy stuff though..
Unless your partner is a bit fluffy :-0 ho ho ho..

Better it’s winter. NOT SUMMER.. Cold is your friend..

Regards

I would watch out for electronics that have a battery inside.  Most audio equipment would not have this, but something like a VCR that has a time-clock inside which needs to keep running even if the device is not plugged in.  The condensation could cause a short inside with live battery, even if it is very low voltage.