Two gun trunk cases were likely devised in a time when traveling aristocrats, or other wealthy, took trips by train. The two guns were protected against all but the worst baggage handlers, and as said by another, not carried by the owner himself. I've never seen the practicality for American hunters, traveling or otherwise. When I fly with guns they are in something much more substantial than an oak and leather case.

YMMV, SRH

May God bless America and those who defend her.