How much Empty weight Volvo 670 trucks with trailer?

Between 30,000 and 34,000 lbs, depending on what features the truck has (more options typically add more tare weight), what motor it has (the Volvo VE D 12 would be the lightest available motor, the Volvo VE D 16 would be the heaviest, and the Cummins ISX and C12/13/15 Caterpillar motors would be in between those two as far as weight), and the trailer (what type it is, what it's made out of, the length of it, etc).