15,000 - 16,000 lbs, depending on specifics.
The M2 family ranges from Class 5 to Class 8 trucks... weights vary greatly throughout, not to mention there's the matter of configuration (e.g., box van, dump truck, etc).
The curb weight of the 2006 Mercedes-Benz S-Class is 3980 lbs..
The curb weight of the 2006 Mercedes-Benz E-Class is 3703 lbs..
The curb weight of the 2006 Mercedes-Benz SLK-Class is 3209 lbs..
The curb weight of the 2006 Mercedes-Benz SL-Class is 4065 lbs..
The curb weight of the 2006 Mercedes-Benz C-Class is 3405 lbs..
The curb weight of the 2006 Mercedes-Benz CL-Class is 4085 lbs..
The curb weight of the 2006 Mercedes-Benz M-Class is 4623 lbs..
The curb weight of the 2006 Mercedes-Benz G-Class is 5545 lbs..
The curb weight of the 2006 Mercedes-Benz CLS-Class is 4050 lbs..
The gross weight of the 2006 Mercedes-Benz M-Class is 6239 lbs..
Kenworth... what? Kenworth manufactures a range of trucks from Class 5 through Class 8... as is, we don't know if you're talking about a T300 box truck, a T800W heavy haul tractor, a W900L line haul tractor, a T800 dump truck, etc. Need to be more specific.