Quote:
Originally Posted by Andyman
If the tow vehicle has an engine that is too big for good fuel economy, then it may still make sense to run a smaller engine on the trailer and turn off the tow vehicle's engine.
If the tow vehicle has an efficient engine, then I would try adding a steam engine to the trailer to use the waste heat from the tow vehicle's exhaust.
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Such would be a perfect application for a Stirling Engine:
Stirling engine - Wikipedia, the free encyclopedia
They work well with low temperature differences, so remaining exhaust heat would could be converted to motive force. It would work especially well on long cruises.