Diamond C FMAX312: Fleetneck Gooseneck
Specifications, configurations, and buyer fit for the Diamond C FMAX312 Fleetneck Gooseneck.
The FMAX312 is a current Diamond C model. The published specifications below come from the manufacturer’s spec sheet. Confirm the current numbers with your dealer before you buy.
Published Specifications
| GVWR | 30,000 lb |
|---|---|
| Empty weight | 8,330-13,080 lb |
| Lengths | 25-44 ft |
| Width | 102 in |
| Axles | 3x 12,000 lb Lippert |
| Tires | 14-ply all-steel radials |
| Coupler | Bulldog BX1 or 3 in 40K adjustable |
Fleetneck triple-axle gooseneck
Read from the manufacturer's published page on July 19, 2026. Options and model-year changes alter these figures, verify the current sheet with the dealer.
Manufacturer Source
Diamond C listed this model family as active when checked on July 19, 2026. Confirm current specifications, options, and local availability directly with the manufacturer and dealer.
View the official Diamond C FMAX312 page →