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I'm a big fan of real winter tires (mountain-snowflake symbol on the sidewall) in snowy climates. The kind you have to switch out twice a year. I'm rather a lot of money into the set on my 4x4, but I think they were worth every penny there. I wouldn't dream of driving my 2wd in the winter without at least two dedicated snows, now that I've had them.
That said...if you're just gonna add weight, I used to run either 240 or 320 lbs of concrete (three or four 80 lb sacks) in my Ranger...an F-150 would probably warrant a bit more.
They also make a thing you can fill with water and still allows you to put a certain amount of weight on top of it in case you need to carry something. I'll see if I can find the link.
Edit:
http://www.shurtrax.com/shurtrax-fullsize-stlw0056.html