The 16-year-olds went drinking before creating a trail of destruction among parked cars on Friday night in Hagen, North Rhine-Westphalia, police said on Saturday.
In scenes hardly reminiscent of Grand Theft Auto, they first they smashed into two parked cars, completely writing them off, before then reversing into a third car so hard, it was catapulted into the air and turned over.
They then hit a fourth car which was parked in a row, smashing into it from behind so that it and the three in front of it all smashed into each other.
It is thought the damage caused could amount to at least €100,000. The only injury was to one of the boys, who was slightly hurt, police said.
The truck belonged to the roofing firm at which one of the boys was an apprentice.