|   The Traffic Accident Reconstruction Origin -ARnews- 
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I hope you have some good witness statements, or you could be in for quite a chore.  It sounds as though you may have some narrow loading (similar to a narrow fixed object collision) it also sounds like you may have extended contact and shear, and therefor, no match-up of speed through the C.G.'s.  Then how would you apply the existing crash tests database of empirical studies to this event?  
If you had good indications of a common post-impact speed through the c.g., and a finite area of narrow  loading, you might try to model the truck collision after a pole/tree.  Then apply the corollary of Newton Three which says mass and speed change are inversely proportional.  Otherwise,......
Ed 
Ed Phillips
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