Hey bbjsw10,
I have a home built "teardrop trailer" camper, which I pull with four cylinders.
Most traditional teardrops really aren't that aerodynamic. The sketch you have at the top with the tapered sides looks like a great variation on it though.
I had a thread a while back about
somebody elses teardrop which actually improved the fuel economy on her pickup truck while she pulled it. The had a 6-cyliner truck with a cap on it. I think her teardrop became a "tow-along boat-tail"!
I also talked to
this guy a while back, who built his second teardrop trailer with aerodynamics in mind.
I know it was mentioned in your thread on the Metro Forum, but if you haven't yet, make sure to check out
Teardrops & Tiny Travel Trailers :: Index it is THE PLACE for small and retro trailer building!!! That's where I got started working on mine.