Bill made some points to me that reminded me that every vehicle is different and requires different strategies for handling difficult roads such as the Coquihalla. I would say that an engine temperature GUAGE is extremely important in avoiding boil-overs because you can prevent heat buildup before it becomes an emergency stop on a freeway that has narrow shoulders.
Also, when I said "anything less that anything comparable to the Tahoe", there are a lot of variables. Some of the newer 6 and 8 speed transmissions make the V6 engines capable of handling such roads. I'm not sure about older V6's with the traditional 3 and 4 speed transmissions.
I wasn't trying to make a plug for Chevy, just that you don't want to be towing at your limit for highways like the Coq.
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