Here's another way.
Take the existing Trailer for Two profile PDF.
Lay out the rear curve using a 2.5" horizontal grid, rather than the 3" grid shown. This will shorten the rear curve to an overall length of 50".
Lay out the front curve using the same 2.5" horizontal grid but ending with the front at 96". This will shorten the front curve to an overall length of 40".
This will leave a 6" length of flat top between the front and rear curves, instead of the original 12".
The result looks like this:

- 8ft-MITeardrop.JPG (23.72 KiB) Viewed 694 times
It's not as pretty as a 10ft Trailer for Two, but you can't shorten the shape and have it look the same.
Beware: because the Trailer for Two profile curves in at the front, a body that is 8ft long overall will only be about 92" at deck level. If you are trying to make a profile that will fit on an 8ft long trailer frame, you need to increase that 6" flat length between the two curves.