Tom -
Let me start by saying that I know next to nothing about cars so I'm not sure if this lead is anything concrete. File this simply under the "I wonder" category.
I'm not even sure what made me think of a possible connection but I have a photo of a truck that was parked in Adventureland in 2003 near the exit to the Jungle Cruise that may be the Carnation truck repurposed.

(You can click on the picture to be taken to my Flickr account where there's a larger image available.)
It's definitely not the same body but it appears to be the same chassis. I tried finding some other photos of the Carnation truck for comparison and it seems like it could be the same. This one has the same wheels (though not the same tires), the front fenders look like they might have been the Carnation truck's rear fenders, and even the Carnation truck's headlights look like they've been mounted under the windshield just below the net with the coconuts. Like I said, I know nothing about cars but even the engine housing looks the same.
Unfortunately, I don't know where this truck is anymore. I haven't seen it in Adventureland for a number of years. As I mentioned, my photo is from 2003 but I think the truck was parked there for a number of years.
Not sure if this helps much but maybe it does a little.
Matt
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