you might consider (depending on how often you'll be moving or alternate tops IDK) making it angle up towards your camper kind of like a box truck top of cab versus a semi cab (pictured).
I'm still a noobie at aero stuff so I'm not sure how well it would work. or what you would get from it, but something to think about atleast.
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1973 Fiat 124 Special
1975 Honda Civic CVCC 4spd
1981 Kawasaki KZ750E
1981 Kawasaki KZ650 CSR
1983 Kawasaki KZ1100-A3
1986 Nissan 300zx Turbo 5 spd
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