GM describes the new SAE J2807 test like this:
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Performance standards for trailering vehicles: To help ensure that vehicles can confidently tow the rated maximum trailer weight under a variety of real-world driving conditions, SAE J2807 establishes specific test protocols. These include:
Cooling capability on a long highway upgrade modeled on the Davis Dam grade on Arizona SR 68;
Launch and acceleration performance on a level road and a 12 percent upgrade;
Combined handling performance – understeer and trailer sway;
Combined braking performance – stopping distance and parking brake-hold on grade; and
Structural performance for the vehicle and hitch or hitch receiver.
New calculations for trailer weight ratings: In addition to the performance standards, SAE J2807 also uses a specific set of assumptions to calculate maximum trailer weight ratings:
For light-duty full-size pickups (GVWR < 8,500 lbs.), SAE J2807 assumes that the tow vehicle includes any options with higher than 33 percent penetration;
It assumes there is both a driver and passenger in the vehicle, each weighing 150 pounds;
It assumes that tow vehicles also include up to 70 pounds of aftermarket hitch equipment (where applicable); and
For conventional trailer towing, SAE J2807 assumes that 10 percent of the trailer weight is on the tongue.
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Here's how some of the most popular Silverado/Sierra 1500 configurations compare with last year:
Configuration
2014 Rating / 2015 J2807 Rating
Regular cab 2WD 4.3L V-6 6.5’ box 3.43 axle
6,400 lbs. / 6,100 lbs.
Double cab 2WD 5.3L V-8 6.5’ box 3.08 axle
6,900 lbs. / 6,500 lbs.
Crew cab 2WD 5.3L V-8 5.7’ box 3.42 axle
9,800 lbs. / 9,400 lbs.
Regular cab 4x4 4.3L V-6 6.5’ box 3.42 axle
7,600 lbs. / 7,600 lbs.
Double cab 4x4 5.3L V-8 6.5’ box 3.42 axle
9,600 lbs. / 9,200 lbs.
Crew cab 4x4 5.3L V-8 5.7’ box 3.73 axle
11,200 lbs. / 10,800 lbs.
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