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2012 Construction SymposiumOmni Dallas HotelAugust 23, 2012
Robert J KrouseGeneral Motors Trailering Engineer
SAE Tow Vehicle Trailer RatingCommittee Chairman
2012 Construction Symposium• What is Trailering?– Just another vehicle spec number?• Torque, Horsepower, Cab-to-axle distance, Brake rotor
size, payload, etc…and Trailer Weight Rating
– Actually everything the vehicle already does…• Launch, accelerate, maneuver, stop, etc—all under
more difficult conditions
– Operator controls the setup– Many different trailer types
2012 Construction Symposium
Just a rating spec?
2012 Construction Symposium• And when we think we’ve found worst case…
2012 Construction Symposium• Rigorous Testing– Powertrain, Thermal, Dynamics & Structure
2012 Construction Symposium• Ratings Comparison
Late 1990s 2012
1/2 Ton Pickup 7,500 10,700
1-Ton Dually 10,000 18,000
1-Ton Dually Gooseneck
13,000 22,800
2012 Construction Symposium• Trailer Weight Rating depends on what you
carry as well as what you can pull
Front Axle Wt Rear Axle Wt
Gross Vehicle Weight
Kingpin Wt
(or Tongue Wt)
Trailer Weight
2012 Construction Symposium• Overload is not good for any tow vehicle
2012 Construction Symposium• Industry Standardization (through SAE)– Specific test trailers and setup– Structural requirements– Launch, acceleration and highway gradeability
(including thermal performance)– Understeer and sway damping– Stopping distance and park brake hold– Vehicle weight considerations
2012 Construction Symposium• SAE Tow Vehicle Trailer Rating Committee
gathered its own handling data
2012 Construction Symposium• Weight Carrying & Weight Distributing Hitches
– Many trucks have higher Trailer Weight Ratings with WD hitch
2012 Construction Symposium• Brake Performance
– Stay out of the ditch (but on top of the cliff)
2012 Construction Symposium• Owner/Operator Role– Heed the ratings– Maintenance (truck and trailer)– Proper setup– Driving style (don’t be in a hurry)– Proper equipment, including…
2012 Construction Symposium• The right truck
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