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I would check your rear brake cable to make sure it ain't sticking. Also make sure the pad (shoe) ain't sticking to the drum. This is a common problem with ford shoes. They get moisture soaked and stick to the drum.
Another thing I learned a long time ago. Never apply the emergancy brakes in the winter time. Sometimes they will freeze and won't release.
After eliminating your present problem you might want to consider removing the brake cable and lubeing it heavily with a product called LOCK-EZE this will stop it from ever freezing again. The product is liquid graphite.
Just climb under the truck, driver side, and see if the cable is tight or loose, see if it makes a difference when you apply or release the ebrake. Mine bound so tight once, I had to get it towed. It took a come-along to get it undone. Ford payed for the whole thing though.
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