I don't get the teardrop trailers; assuming they are loaded/unloaded via forklifts moving pallets, the choices with teardropping the roof are to add frontal area which is unusable as interior volume, or to decrease the vertical space for loads at, oh, the back 1/3 of the trailer, which leads to either putting all the taller loads at the front (manually after it's in?), or making all the loads shorter, or playing a shell game with loads upon load/unload, or risking hitting the roof of the trailer with a tall load in a moment of confusion.