Since the winters here don't get
REAL bad, like Jim said. It won't get below freezing very many days here so I don't have to "winterize" my truck. Here's what I do in the winter
1) Full tank of gas or not?
(neither, I drive it everyday)
2) Use Sta-Bil? If so, should it be thoroughly burned through the system?
(don't use it)
3) Covers - are they a good or bad idea to use?
(no cover)
4) I was told by a friend that I should park my truck on a tarp to keep moisture from being trapped under the truck (and therefor causing the underside to rust just from sitting). Is this a good idea or not?
(never heard of that
)
5) Should the engine be fogged? We fog our boat every year, but that has a carb and no emissions equipment (cats nor O2 sensors).

6) Put the vehicle on jack stands / blocks?
(Depends on how long you're planning on it sitting, if it's for just a few months i wouldn't worry about it)
7) Leave battery in vehicle or not?
(I drive it everyday)
8) Is a battery tender device worth it?
I will say that this past winter it snowed for a good 7 days total and the street department uses sand instead of salt on the roads. On the days i didn't drive my truck i would go and let it run for a while so the block wouldn't freeze up. What are winter's like up there?