The toyota cvt cars that are provisioned to pull something or are made for rough terrain (similar to climbing) are equipped with extra parts right from the factory. E.g. the taxi spec camry used elsewhere is same as regular GCC spec camry due to having a HD cooling system along extra heat exchangers for the transmission.
Lets take your point. The tons of ncp cars making it up and down the hill has no value because you do not know how many times it has done it and what the driver/owner had to do and is the car in actual original spec because all you are seeing is them on the road, and neither are the cars a uniform spec, some can be JDM while some can be for other markets and some can be GEM.
What Im presenting is actual data, lookup the parts catalog for GCC and US federal model (they use HD system) - you will see the difference,
For transmission cooling sometimes even a deeper sump holding an extra liter is enough (like some bmws which used chevy automatics in the past)
