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So far I've confirmed that in 1952 Reo offered propane-powered commercial trucks. As the Gold Comet (OA-331) was one of their most popular engines - I'd say the info and technology is there. I'll keep looking. DD

Lots of engines of this vintage were offered in LP configurations - and the OA-331 (which is a Reo design, but more were needed than Reo could make - so Continental was licensed to make copies) was heavily promoted for commercial use. I'll look through some of my vintage ads and see what I can...