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CODFISH was a joke acronym made up by a former GasSavers member: "Coasting On Demand, Fuel & Ignition SHut off", if memory serves. He was just poking fun at the ridiculous number of acronyms that seem to have been made up by the hypermiling community. (Also he was a native Newfoundlander, so there was some regional humour in there too...)
As for actually USING the technique, I wouldn't if your car isn't specifically designed for "flat towing". You may be causing cumulative damage to the transmission from lack of lubrication if the engine isn't turning the input shaft while the vehicle is coasting. Your owners manual should say whether it's acceptable or not.
trikkonceptz' advice of engine-on coasting is a decent option (if not quite as efficient).
I also think it's odd that the Caravan won't start in N. That strikes me as a potential safety concern. (If the engine should ever stall for any reason when in motion, you'd want to be able to attempt restarting it without having to come to a full stop.)
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