Because you are not on the hwy running high speeds, I wouldn't worry about the aero of your cargo box. Space is going to be much more important for you, as is having an extremely secure mounting system.
Adding a passenger and needing to be able to remove the rear seat to refuel complicates the issue significantly. Look at what others (sendler comes to mind) have done to mount a large cargo box for ideas.
It's going to end-up being pretty high and far back, and its packed weight could cause some issues.
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