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In the case of your truck, what your kids were seeing was a double reflection. Sun light was reflected from two different wheels into their eyes, and both wheels had a slightly different rotation speed (due to a different diameter). So you probably saw one wheel slowly turning backwards and another one forward. Maybe the other wheel was not directly visible so the backwards effect was predominant.
While I hear what you are saying, JCL, I highly doubt this is what happened. The affect was on the front wheel and the second wheel on th cab was a bit too far away to cause this affect. The wheels on the trailer did not have shiny rims. I am guessing it is even simpler than you stated. It probably only had to do with the way the light was reflecting off the nuts, onto the rim and back into our eyes. BTW - It wasn't just my children that saw it. I did too. It was quite cool.
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