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Ever since seeing this (and other photos I've taken showing similar effects) I haven't worried about it much.

This was one of our support vehicles for task force Python, having made its way from Ft. Carson all the way down to New Orleans. And I venture to say that wasn't fresh paint either. I'd also bet that tank tires don't flex as much as pneumatic tires do.
You'd be gigged horribly by the judges for presenting something like this at a contest:

Eh, OK. My frame of reference is Desert Shield/Storm, where the entire vehicle was sprayed desert sand upon arrival but the hub/tire demarcation line was razor sharp and the track blocks clean once the vehicles were at their units.
Unusual things are perfectly acceptable in contests if you make it clear that it is what you are trying to model. The problem is when people are just sloppy or indifferent and try to pass things off as real because "You can't prove it didn't happen!!"
In the world of model railroading the realism-minded guys noticed a long time ago that real trains didn't look like Christmas train sets, with yellow pickle cars, orange billboard reefers, and silver helium cars, rather they were long sets of dull red boxcars and grimy black hoppers. The hard part isn't including the unusual but making the mundane look interesting.
KL