We are currently working on an educational video game about the Viking Age. In this we want to make as historically accurate illustrations as possible.
I myself am working as a historian on the project. Many years ago I worked with Viking Age history, and I remember a discussion on whether or not vikings stored their shields on the side of their longboats when they travelled.
As far as I remember, archaeological and historical sources indicate that they did, though modern experimental archaeology has had difficulties figuring out exactly how it would be pratical to do this.
I am looking for arguments from both sides, and would really appreciate source citations (preferably peer-reviewed, but anything can be useful), so I can read the research and present it to our team.