Michael:
The predefined layouts available for the RadListView are covered on the
Understanding the HTML Output and CSS Styling documentation page and demonstrated in
this online demo. It would be difficult to define a custom template to transpose the display of the listview items.
I believe that the best way to accomplish this is to transpose your data prior to assigning it as the RadListView.DataSource.
Here are a couple of articles relating to this option:
Transpose or just rows as columns
Transpose a DataTable using C#
I hope this helps!