Forum Discussion
rjstractor
Sep 10, 2019Nomad
The "80% rule" is made up and has no basis in fact. As the gross combined weight of any tow vehicle increases, performance and durability decline. At the GCWR, a parameter of performance, whether it's braking, acceleration, handling or starting gradeability has declined to the point where one or more of these factors is not acceptable to the manufacturer. An individual's idea of acceptable performance and/or durability may differ from that of the OEM. For some folks it's at 80%, others will pull 1 1/2 times a truck's GCWR and not think twice about it.
A somewhat separate issue discussed ad nauseum on this forum is the fact that in some cases a truck will be overloaded in terms of GVWR or GAWR long before its rated GCWR is reached, and other trucks will hit their GCWR with plenty of gross and axle weight to spare. The moral of the story is that all the various capacities of each truck must be evaluated against a specific trailer to determine whether it's a good fit.
A somewhat separate issue discussed ad nauseum on this forum is the fact that in some cases a truck will be overloaded in terms of GVWR or GAWR long before its rated GCWR is reached, and other trucks will hit their GCWR with plenty of gross and axle weight to spare. The moral of the story is that all the various capacities of each truck must be evaluated against a specific trailer to determine whether it's a good fit.
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