[aerohead]

I agree with Bicycle Bob,and would choose the top for greatest drag reduction.----------------- The bottom image might be a compromise and with that,I would include a rear spoiler angling up and to the rear to intersect the teardrop template line.Can't be steeper than 30-degrees from horizon or drag starts to go up again.--------------------- Since the two central images fall below the teardrop line,they would as Bob has mentioned,be in separated flow and of no benefit.-------------------------- If the length issue scares you,remember,you can chop it off vertically wherever you like.Just know that the length is what is buying the drag reduction.