The 1988–1998 GMT400 3500 Dually is a capable hauler, but understanding the real limits of payload is critical for safe operation. Here’s what you need to know.
What Is Payload Capacity?
Payload is the total weight your truck can carry inside the cab and bed, including passengers. It’s different from towing capacity (which is what you can pull).
Factory Payload for GMT400 3500 Dually:
The 3500 Dually payload varies significantly based on cab style and options:
- Regular Cab Dually: Up to 4,500 lbs payload
- Extended Cab Dually: ~3,800 lbs
- Crew Cab Dually: ~3,200 lbs
Always check your door placard for your specific truck’s rating.
What Counts Toward Payload:
- All passengers (use 150 lbs each)
- Cargo in bed
- Gooseneck ball weight (if equipped)
- Fifth wheel pin weight
- Tool boxes and equipment
Using a GMT400 Dually for Farming/Construction:
The 3500 dually is commonly used for:
- Flatbed hauling (hay, equipment)
- Service truck bodies
- Fifth wheel RV towing (pin weight counts toward payload)
- Livestock hauling
Suspension Load Management:
Even within payload limits, heavy loads can cause the rear springs to compress significantly. Helper springs or airbag assist (Air Lift 57140 or similar) help maintain proper ride height and stability under maximum load.
GVWR vs Payload:
GVWR (Gross Vehicle Weight Rating) = Empty Truck Weight + Payload Rating
Example: 8,800 lb GVWR – 5,800 lb truck = 3,000 lb payload
Tire Load Rating:
Dually trucks require tires with E-load rating (10-ply) on all four rear tires to meet the legal payload capacity. Standard LT tires may not be sufficient.
Are you running a 3500 dually for work? Share what you’re hauling and how the truck handles it.