While Bachmann and Life Like have done some real foobies = the winner being the "Allegheny Refining Company" single-dome (never existed) I was rather stunned to find out that my personal favorite (for obvious reasons) was the "Gustafson Bros. Oil Company" triple-dome that I finally found a picture of - car was actually SHPX 4554. It's fatter model than the prototype, but it did exist. I have a photo of the real car on my office wall.
I've got a batch of them, two for me and three for my sons, one of which has been turned into a christmas ornament.