Hows the weather? Ice in the brake drum?
Could be the parking brake not letting go.
You can try backing off the brake adjuster.
I had a 90 caravan and the bearing spun and welded itself to the rear spindle, but then the bearing just came apart and the wheel kept turning. Luckily didn't fall right off, but I was only a block from home. Pop the hubcap and bearing cap off and you should be able to tell pretty quick.
Does that have a sealed rear bearing?
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