I love the trooper, and you have the right ideas.
Im not trying to be a downer or anything but that is definitely not the best starting vehicle, and is probably one of the most complicating use-cases for ecomodding. the ONLY thing that they really have in common is the benefits of engine tuning for low rpm efficiency (ie torque)
The belly pan acting as a skid plate can go a long ways, and could be very useful in both use cases. however, if it has a solid axle rear suspension (or front for that matter) , they would really be less than usefully for aerodynamic improvements .
I suspect a removable MASSIVE air dam and kam back would be the best starting points. if you built a off road bumper, you could even incorporate a few mounting points to make it super quick and easy.
I say go for it, and keep us posted!
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