A tear drop trailer continues to be popular because of its size and design. If you want to build your own, then there are tutorials and designs available.
off road trailer
Comfortvan offroad trailer ♣ 12.9.1
TerraDrop: Off Road Capable, Overland -inspired Teardrop Trailer. Built for Adventure! - Oregon Trail'R - Teardrop Trailers and Accessories
I like this compact mil style trailer with living quarters
Iveco Turbo Daily 4x4
Architecture student Hank Butitta converted old school bus into a 225 square foot mobile home with small kitchen, living room, and bedroom.
Moby1 Expedition Trailer - I might even consider camping if I had one of these...
Our Moving-To-Florida ride ;-)