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AS Andyman has stated a bit, this is a MUCH harder integration in a new car than an older car. In my base model Aspire with no power steering, no ESP, no auto trans, etc. integration is easy because almost nothing it automated. If you want to turn off the engine and use it to power you forward you have to come up with a VERY complicated system integration that my company into the GM Tahoe 2 Mode Hybrid.
In the end, aren't you just adding a ton of more weight and in-stability to try and garner minimal payback. Would the powered wagon be able to push the vehicle? IE, would the friction of the tires (dependant on trailer weight) be enough to push the vehicle forward? Will it "bind up" under a normal trailer ball and hitch interface?
I'm not saying it won't work, but there are some obstacles to overcome depending on the car make and model. Now not shutting of the car would be a different story, much easier that way.
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