I spent 10 years working for a large semiconductor company.
Electronic Components used in general consumer grade electronics (Television, DVD, Cell Phone, etc) are built to a commercial temperature spec. The commercial spec is -10*C - 70*C, this is the operating range, but even while sitting idle there is degradation of the component when held outside this range. Heat is a much bigger issue than cold.
TLHDOC's example of LCD screens in his Explorer handle the cold fine. Well that's because components manufactured for the transportation industry typically are specified for the "Automotive Temp Range" (-40*C - 125*C) or "Industrial Temp Range" (-40*C - 85*C) and that explorer probably doesnt sit unused as much as a TT in the winter.
Dmax's statement that they "are not shipped in heated containers/trucks" although true isn't a good comparison. Electronics in transit are typically packaged in corrugated cardboard boxes with foam corners suspending the device. Then the boxes are tightly packed together, basically building one large insulating mass. Even the coldest Arctic crossing I doubt the electronics are being subjected to sub zero temps.
Now, after all that, where do you live. If you expect to see several weeks or months of sustained sub zero I'ld probably take it out. If you are like me and live in Central CA where we get 20+\- nights in the teens just leave it.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)