There was an article in an old car hobby magazine (Cars & Parts or maybe Car Classics or Car Collector) back in the 1970's about a Muntz-built Kaiser pick-up truck. The one page article showed a picture or two and described it as having a Pontiac straight eight under the hood. It was a 1949-1950 Kaiser with a separate pickup bed (not Ranchero-style "unibody") and a tailgate that said KAISER.
This same truck was once owned by Jim Davies in the Atlanta area and was sold after he died in the 1980's or early 1990's. I saw the truck once. It was white at the time and had thick spoke wheels on it.
John Parker told me many years ago that he once did work on this truck when it was a car. When he examined the truck once (I think at a KFOC National), he found some welding that he recognized as his own work underneath. He did that welding work in the 1960's or 1970's (I can't remember) which means it was NOT a truck (still a car) at the time Muntz supposedly converted it (late 1940's).
That's all I know about one truck, I cannot speak for any of the other Kaiser or Frazer trucks that may be out there. I just think every one of them is pretty cool and should be restored as pick-up trucks and shared with the rest of us.
And Frankie, no one will get pissed off - we just want truth and documentation. If it's real, great. If it's not, so what? It's still pretty cool.