Can't really see a definite answer, for instance I've put towbars on several cars in the past, but did little towing, it was mainly for cycle racks, so having no effect on the car.
But, and it's a big but, I always took the tow bar off before I sold the car, as selling it separately part funded the next one, and I reused the electrics.
So there's no guarantee that a car without a towbar hasn't had one on, particularly if it's, as you described, "towbar ready".
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Just my opinion, please don't shoot me if it doesn't match yours!
2011 C70 D3 (now sold)and JZR 3 wheeler
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