The ABS on these trucks is rear wheel only. I would reccomend running the factory tire pressure (26psi) to help with traction. They handle the winter perfectly. That is why I bought mine!
About the 4wd. It says that in 4hi you can do highway speeds but if you need 4wd on, should you really be going that fast? I don't run winter tires but it would probably help. Or just get some AT's.
Just drive how you would normally drive in the winter, leave lots of stopping distance, start off slowly, etc...
Also check your frame for rust, clean it out and have it undercoated/oil sprayed. There are many threads on this forum to show why you should do this.