Hmmm..
I realize the choice was made in haste, but if I was driving 45,000 pounds, I wouldn't worry about the deer damaging the truck - cream the sucker.
Years ago a truck driver told me if an accident with an animal is unavoidable the best thing to do is floor it, and try to knock the animal away, thus minimizing damage to the truck.
I am not sure if I buy that, but crashing is certainly a worse option.