Sometime larger fish can experience some damage during transport from bumping into the walls when the vehicle make turns at speed.
I saw that once with a LMB delivery, where some of the LMB actually had broken lower jaws at the front most area. Fish guy said it was due to transport.
If that was really true, then maybe you'd want some kind of internal netting to prevent impact with the walls.
However, if others like FIH, have not had this issue, then disregard my comment.
