Are the Durango wings you reference actually "molded" into the body, as you mentioned the rule saying, or are they in fact a bolt-on piece?
If they're bolt-on, then I would guess the rule would be in direct reference to their use. Otherwise, if you're referencing the rear/side "winglets," many manufacturers have been including them.
As far as the tyre width rule, I can't think of any reason to mention it other than a couple of recent product releases: at least one wheel manufacturer started making slightly wider (+3mm) wheels, and Associated's SCB includes narrow front rims and tyres.
I hope the Proline 14RS, along with their new Focus rally, bodyshells aren't allowed - and a simple mention like, "short course truck style bodies only" could clarify things.
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