Your dream means that a recurring event is happening to you at the moment or is going to happen in either your social, family or relationship life, which will affect you emotionally, and in different places. The reason why it is reccuring is because it is an event that is having an impact on you, are you in the process of leaving work? splitting up with your partner? do you travel around a lot for any reason?
You also may be doing something which is not favourable to you or your inner consiousness. You sound like you may have an inner stress or are frustrated about something, hence the damage it is doing to you. (this is represented in where you die, and where you dont die your inner consciousness is letting you know that sometimes the unfavourable thing you are doing is not as heavy as at other times).
The truck is a very nasty thing and you are stressed. You need to take time out and be more free within your self and the dream should stop. Conduct your personal affairs nicely and sort out any people probs you may have, especially family and relationships, which i think the problem is. Stop worrying about money and check your blood count with your GP for anaemia..your body may need more energy.