BM-Volvo DR 631
The machine was called Gruskalle – which translated into English would be Gravel Charlie.
| DR 631 | specifications |
| Engine | BM 1113 TR |
| Engine output (SAE), hp / r/min | 65 / 2 000 |
| Load, t/m3 | 10 / 6,5 |
| Tires front | 15-34/14 |
| Tires rear | 14.00-24/20 |
| No. of driven wheels | 4x4 |
| Weight, t | 8,39 |
| Production year | 1966–1967 |