I have towed more than 2000lbs in my Insight. It has no tow rating at all. Some factors that seem important:
-Being able to stop - trailer brakes basically make this irrelevant
-Being able to control the load - the weight of the tow vehicle and distribution of weight in the trailer are hugely important here
-Drivetrain needs to be able to handle the cooling load. In a manual, transmission temperature is a non-issue.
Tow ratings for the same vehicle are vastly different in different countries.
I'm inclined to believe that tow ratings are (at least to some degree) political and subjective.
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