CWSWine
Well-known member
Will I think it is and here are some of the reasons I believe that.
I Quote
"There?s a common misconception that a truck?s GVWR is determined by adding gross axle weight ratings (GAWRs) together for all axles. Although this was a common way of calculating GVWR many years ago, it?s no longer an accurate method. The chassis manufacturer task of establishing a vehicle GVWR is much more difficult today due to advancement of safety system standards and how vehicles meet these requirements. This is why many trucks have a GVWR much lower than the combined axle ratings. It is not uncommon for a truck with a GVWR of 19,500 pounds to have a front axle rated at 7,500 pounds and a rear axle rated at 14,700 pounds. Safety standards that apply to braking, vehicle stability, and chassis manufacturer internal standards for durability, dynamic stability and handling can restrict GVWR even though the sum of the axle ratings exceeds 22,000 pounds. In this instance, the OEM set the GVWR at 19,500 pounds based on test results and vehicle dynamic performance to ensure a safe, reliable truck.
?
.
.
?As a company or fleet, you?re placing your employees in these vehicles. It is very important to company wellbeing and employee safety to make sure the trucks you purchase are designed for their intended purposes, and GVWR and GCWR are specified properly for safe, efficient operation.?
By Bob Raybuck Director of Technical Services NTEA"
End Quote
================================
SAE J2807 States that exceeding the GVWR is a reason to fail
Quote
"5.4 GVWR/Rear GAWR and Tongue Weight/Kingpin Weight Considerations
The tow vehicle shall be able to accommodate appropriate trailer tongue and/or kingpin weight to attain a particular TWR
without exceeding Rear GAWR and/or GVWR. Required minimum conventional trailer tongue weight shall be 10% of TWR and required minimum fifth wheel or gooseneck trailer kingpin weight shall be 15% of TWR."
End Quote
TWR = Trailer Weight Rating
http://fifthwheelst.com/documents/tow-test-standards-2016-02.pdf
==================================
From Fords Towing Guides.
Quote
?5th-Wheel Towing Notes:
This information also applies to models with pickup box delete option (66D). Trailer kingpin load weight should be 15% of total loaded trailer weight. Make sure that the vehicle payload (reduced by option weight) will accommodate trailer kingpin load weight and the weight of passengers and cargo added to the towing vehicle. The addition of trailer kingpin load weight, and the weight of passengers and cargo, must not cause vehicle weights to exceed the rear GAWR (Gross Axle Weight Rating) or GVWR (Gross Vehicle Weight Rating). These ratings can be found on the vehicle?s Safety Compliance Certification LabeL?
End Quote
On Page 30
https://www.ford.com/services/assets/Brochure?bodystyle=Truck&make=Ford&model=SuperDuty&year=2018
===================================
For me, there is just to much evidence like the manufacturers towing guides, the trucks user manual, SAE and now NETA using GVWR to brush it off as just for registration and not a real rating to adhere to.
I Quote
"There?s a common misconception that a truck?s GVWR is determined by adding gross axle weight ratings (GAWRs) together for all axles. Although this was a common way of calculating GVWR many years ago, it?s no longer an accurate method. The chassis manufacturer task of establishing a vehicle GVWR is much more difficult today due to advancement of safety system standards and how vehicles meet these requirements. This is why many trucks have a GVWR much lower than the combined axle ratings. It is not uncommon for a truck with a GVWR of 19,500 pounds to have a front axle rated at 7,500 pounds and a rear axle rated at 14,700 pounds. Safety standards that apply to braking, vehicle stability, and chassis manufacturer internal standards for durability, dynamic stability and handling can restrict GVWR even though the sum of the axle ratings exceeds 22,000 pounds. In this instance, the OEM set the GVWR at 19,500 pounds based on test results and vehicle dynamic performance to ensure a safe, reliable truck.
?
.
.
?As a company or fleet, you?re placing your employees in these vehicles. It is very important to company wellbeing and employee safety to make sure the trucks you purchase are designed for their intended purposes, and GVWR and GCWR are specified properly for safe, efficient operation.?
By Bob Raybuck Director of Technical Services NTEA"
End Quote
================================
SAE J2807 States that exceeding the GVWR is a reason to fail
Quote
"5.4 GVWR/Rear GAWR and Tongue Weight/Kingpin Weight Considerations
The tow vehicle shall be able to accommodate appropriate trailer tongue and/or kingpin weight to attain a particular TWR
without exceeding Rear GAWR and/or GVWR. Required minimum conventional trailer tongue weight shall be 10% of TWR and required minimum fifth wheel or gooseneck trailer kingpin weight shall be 15% of TWR."
End Quote
TWR = Trailer Weight Rating
http://fifthwheelst.com/documents/tow-test-standards-2016-02.pdf
==================================
From Fords Towing Guides.
Quote
?5th-Wheel Towing Notes:
This information also applies to models with pickup box delete option (66D). Trailer kingpin load weight should be 15% of total loaded trailer weight. Make sure that the vehicle payload (reduced by option weight) will accommodate trailer kingpin load weight and the weight of passengers and cargo added to the towing vehicle. The addition of trailer kingpin load weight, and the weight of passengers and cargo, must not cause vehicle weights to exceed the rear GAWR (Gross Axle Weight Rating) or GVWR (Gross Vehicle Weight Rating). These ratings can be found on the vehicle?s Safety Compliance Certification LabeL?
End Quote
On Page 30
https://www.ford.com/services/assets/Brochure?bodystyle=Truck&make=Ford&model=SuperDuty&year=2018
===================================
For me, there is just to much evidence like the manufacturers towing guides, the trucks user manual, SAE and now NETA using GVWR to brush it off as just for registration and not a real rating to adhere to.