This happened to me a few years ago - my car book value £300-£400 - 15 tonne truck reversed over it - it was considerably shorter and lower
The truck driver even commented how good my brakes were
anyway - offer from their insurance £300..........after a lot of argueing (and continued use of a supplied hire car - which probably cost them another £500 or more - I managed to get £600 off them - claiming that it was not possible to replace the car for £300 etc etc