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I worked on an gasoline-electric hybrid project, '81 Chevy Citation for Bill Brobeck and Associates.
In electric mode, we were running the motor through the GM 'slushbox', and pumping oil to get the required line pressure was a challenge for the team. For a differrent purpose I know, but we did something similar to what you suggest. I mated an OEM power steering pump to a 12v electric motor, and Bill figured out where to tap into the throttle body. I can't remember all the details, I was just the 19yr. old kid who machined the castings, set up the test bench and did what Bill told me to do. BIll stayed up late with the GM manuals and figured out the fluid logic for the project.
I wondered if while flat towing and automatc, a guy couldn't just run the engine, idling in neutral to save the transmission a slow and painful death? I'm guessing the RV guys have already figured this out.
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