Follow Up

Put the truck on jackstands. Tried again to break the rear wheels free by putting it in gear and letting clutch out. No go. Was going to look for parking brake cable problems first, but couldn't really see too well with the wheels on. Removed rear wheels. One came off with no problem. On the other one, the wheel was rusted to the drum.

I took a BFH* and started tapping all the way around the rim. I tapped progressively harder and the wheel soon broke free. Good thing this is an old work truck. I wouldn't want to hit a decent wheel rim with a BFH*.

Tapped the drums on both sides until I could pull them off as well. Like with the wheels, one came off easliy and the other took some hammer persuasion. The drum was clearly rusted to the shoe on the driver's side. After getting the drum loose, the rear wheels spun freely. Put everything back together and took it for a short cautious ride. Everything seems normal.

From now on, after launching boats, I will either drive the truck long enough to dry out the wheels or I will make sure not to engage the parking break.

Thanks for letting me ask this question in this great forum.

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*BFH - Big F'ing Hammer (a term I learned working in a full service gas station when I was in high school).