My guess would be - cooling. A fairly stock 2017 Porsche Cayenne recently towed the Airbus A380 which is about 790K+ lbs but for a very short distance. So just the hardware should be able to handle well over 7700 lbs.
Quote:
Originally Posted by DuSh
Interesting to know (just out of curiosity) what is the limiting element in BMW load specs 7700lbs? Let's say we had 40d and 50d like in Europe - I'm sure they can easily tow even more than that, unless transmission is limiting factor?
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