Hey Terry, I'd bet your cuz's car was actually a '28 Chevy instead of a '29. The '25-'28 were the ones most notorious for this. In 1929 the car was totally revamped to now included a longer wheelbase (5-6" longer than a Model-A), a 6 cylinder engine, different axle and brakes. Comparing a 1928 Chevy to a '29 is like comparing a 1927 Ford to a 1928.
Hey Richard, if you decide you need to do two fire trucks, my Dad (who lives just outside of Johnson City) has a 1927/28 Chev. firetruck that came from Idabell, OK. He's had it for 40 years and I doubt he will ever restore it himself so you might should consider clearing some space for a twin!! Kinda like a His & Hers set.
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