The continuity of the shots of the truck are very poor in the move.
When the truck hits the second vehicle, the MG Midget, the front grill is already badly damaged. Later it is back in place and only the headlight is damaged. Finally at nearly the end of the chase (the main picture) the cab is completely undamaged, and seconds later is completely smashed again before it explodes.
Looking at the pictures again probably two trucks were used as the design of the striped areas on the side of the cab is different between some scenes in the movie.