Multi-track steel doors, that may cross. They can bunch at the outrigger end leaving the entire end of the building open. Tailgate is an expensive option.
Pros and Cons:
Sometimes there is no apron space on one side, so all the doors have to open to the other side, where they take up more apron. Although it is possible to include a tailgate it is more expensive, so we advise that the whole doorway is made full height.