A Thought About The Various Incarnations Of Optimus Prime

I was talking to someone in the pub last night about Transformers and he said he always had a problem with Prime being a fire truck (RiD). This morning I was thinking that surely most of us fans from the 80s will always think of Prime as a red flat-nosed juggernaut cab. Certainly when I first saw how Prime would look in the Movie it jarred a little until I saw the film. When I saw how powerful (and shiney) the peterbilt looked I started to like the design.
Then I started to think that surely the fire truck is a perfect incarnation for OP...
1) red
2) flat-nosed
3) bloody big
4) gotta have a powerful engine to drag around all that bulk at rapid speeds to reach the fire asap
5) what qualities do we associate with a fire truck? Couragous, self-sacrificing people risking their lives to save the lives of others.
If that doesn't sum up Optimus Prime then what does?
Then I started to think that surely the fire truck is a perfect incarnation for OP...
1) red
2) flat-nosed
3) bloody big
4) gotta have a powerful engine to drag around all that bulk at rapid speeds to reach the fire asap
5) what qualities do we associate with a fire truck? Couragous, self-sacrificing people risking their lives to save the lives of others.
If that doesn't sum up Optimus Prime then what does?