No.
To improve on the 'teardrop' you'd need to tear it down to the deck and start over. Good thing you have a 'virtually limitless' supply of wood.
The reason I say this is the metric is radius equal to 4% of the gross width. 0.04 X 48" is about 2". And that's a
minimum. Consider the 'shepherd's trailer', it's
all radius:
Here's my own thread from 2013:
http://ecomodder.com/forum/showthrea...ted-26565.html
This follows the template to a low resolution. Details are in the thread. It ran three pages.
Lately I've been thinking about converting my Westfalia utility trailer to a teardrop. It's a square tube T-frame under a 3x4' plywood and angle iron box. I could replace the box with a deck and go from there. It has a single swingarm suspension. Since it's only 3' wide it would have 6" wheelwell boxes like a shepherd's trailer. What a Westfalia might look like (not mine):
Edit: Here's another thread:
http://ecomodder.com/forum/showthrea...ion-23333.html
If the stream-lines are parallel do square edges not matter?
This is about shapes that are not produced by rotation, but it's worth pointing out a 4' half-body would have 24" headroom—in the middle. A full rotation would result in zero floor so cutting at about 3/4 height would be a good compromise. Your 4' deck would produce maybe 5' width at mid-height.
2nd Edit: Sorry for going on; I think you've pushed a button.
I was looking for this (Wally Byam's first proto-Airstream [Basecamp]):
and found this:
A shepherd's trailer plan from a 1930/40s magazine.These are all scattered through my user albums. I'd like to sort Trailers into their own category.
3rd Edit: !!!!
Look at the details. That thing is built like a railroad caboose.
If the side board were angled outward, you'd get a nice bubble shape and a good backrest angle in the inside.