The nice thing about the one we rented was that it was very easy to tow behind my small sedan. But when we were inside, I could definitely understand the tendency of people to go with a 10' long model. And while I understand the economies offered by 48" plywood widths, I also wondered what the effect would be of increasing the headroom inside one of these.
I'm very new to this world, and still not sure if it will make more sense to buy a teardrop or build my own. The advantage of building is that it would allow me to customize a trailer to my own needs and tastes. Overall weight is more of an issue for me than it is for SUV or truck owners, particularly because my local camping often involves steep and twisty mountain roads. But if the overall dimensions could change without too big of a weight hit, then there's more for me to think about.
Here's my son enjoying the camp site we found up at 7,000 feet in the National Forest above where we live in Los Angeles. We had a great time, and I slept much better than I ever have in a tent.

And here's an image that shows what I've been thinking about. This is an altered version of David McCamant's (awesome) Atma Travelear profile. I've rounded off the lower front edge for no other reason than liking that shape a little more. And I've shrunk his tongue storage down. And then I've also distorted the shape into a re-proportioned 5' height.

I know that anyone who's spent time looking at teardrop profiles has gotten accustomed to the basic proportions of 4'-high trailers that are either 8' or 10' long. So this might look stranger to people who are more familiar with this world than it would look to the uninitiated. But I'm interested in any opinions or thoughts anyone might have.