JIMNLIN wrote:
Your opinion does not line up with SAE J2807 methodology and the Federal Motor Vehicle Safety Standards, Title 49, Section 751.105.
And then asks
If you can provide a document supporting your opinion about the GVWR of 14K, please do so. I would very much like to read it.
You talk about oranges and ask a guy to supply a document about apples.
J2807 is a series of tests to determine a GCWR recommendation and says;
Scope:
This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles and trucks. This includes all vehicles up to 13 000 lb GVWR. It is recommended that the performance requirements within be adopted for all vehicles with model year designation 2013 or later.**
Two items of interest ...
1. Cummins truck is 14000 lbs GVWR and isn't covered in the J2807 recommendation.
2. J2807 only effects those 13k and smaller vehicles built after around 2013.
3. J2807 is nothing regulatory in nature or carry any legal implications for any trucks on the road.
4. I see no CFR 49 751.105 regulation
Apparently, you are reading an outdated J2087. I have the most current document dated FEB2016.
1.SCOPE
This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles and trucks. This includes all vehicles up to 14000 lb GVWR.
True, none of the SAE Standards are regulatory and auto manufacturers can ignore it altogether.
One of your points was "The 14k is to keep the truck in the class 3." How do you know that? Where is a document with that claim? Do you have a document stating that the truck in has been derated? If so, how much?
As an RV safety educator promoting safe towing by not exceeding any of the weight safety ratings, I am ethically bound to the ratings that the manufacturers publish. Not what you or I think what a vehicle may be capable of doing, nor will I follow what the crowd is doing. Which by the way, 60% of the tow vehicles towing trailers exceed at least one weight safety rating.
