CVT is somewhat a misnomer on most hybrid electric cars. They call them eCVT. Technically it is a continuously variable transmission, only it accomplishes the ratio change by running an electric motor/generator at varying speeds in a planetary gearset linked to the ICE.
There's no reason why an eCVT should wear out prematurely even at high load, because the vehicle should be programmed to not operate outside of limits that would cause premature wear. This is why I was not worried to pull 1,800 lbs with my Prius (at slower speeds and plenty of stopping space).
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