Tow Capacity Comparisons For 2015 Trucks

JIMNLIN wrote:
Thanks for posting what GM says about not exceeding the front or REAR axle rating as it reinforces my point I've made that the calculator doesn't take in any of the GAWR's into consideration anywhere which leads to over loading the RAWR on "SOME" high GVWR vehicles with low RAWR numbers.

GAWRs are not the primary function within Title 49 in consideration of braking, tire and rim capacity. Most anyplace where it’s written “GAWR,” it refers to the sum of GAWRs should not be less than GVWR. GVWR is the supreme rating regardless of the sum of GAWRs.

Title 49 says hundreds of tech things but nowhere does it say that GVWR is supreme over the GAWRs.
Tire and rim capacity are selected by the vehicles GAWR if you take the time and read 571.110/.120 and has nothing to do with the trucks GVWR.

Brakes.....
NHTSA says this about components of the GAWR:
"Gross Axle Weight Rating is the rated load-carrying capacity of an individual axle and wheel assembly. (It represents the load that may be steadily sustained by the components in the system; i.e., tires, rims, hubs, bearing, axles, brakes, suspension, sub frame, etc. with the GAWR limited by the components with the lowest working rating"

or another source...

RMA (rubber manufacturers)

• GAWR: Gross Axle Weight Rating (for each axle) -
The maximum weight rating that the components
(tires, rims/wheels, brakes, springs, and axle) of
each axle are designed to support. This is
determined by the lowest design capacity of any
component. In other words, if the wheels have the
lowest design capacity of any component on that
axle, installing tires with a higher load capacity
does not increase the GAWR. By regulation, the
tire load rating times the number of tires on that
axle must equal or exceed the GAWR for that axle.

and for a trailer.....
dexter axle;

The Gross Axle Weight Rating (GAWR) of your running gear is determined by the lowest rated component in the assembly. The capacity of the wheel, tire, axle, brake, springs/rubber and hub are all considered.

You have still chosen not give an answer to my last two questions. Additionally, you're putting words in my mouth that I did not say.

So far you haven't proved that calculators that don't include GAWR fail. Since the calculator discussion has been mostly about RV Tow Check, prove to me, and everyone else, the flaws in RV Tow Check with the following data from real tow vehicles that may tow fifth wheel or conventional trailers.

GCWR:
GVWR:
Front GAWR:
Rear GAWR:
Vehicle GVW:
Vehicle VIN: