There are 2 books on the brigade that the 5th SC Cav. served in, Butler and His Cavalry and Hampton and His Cavalry.
There are also books on the battles they fought in. For example Eric Wittenberg has written a book on the Battle of Trevelian Station where they fought. He is currently writing a book on the Battle of Monroe's Crossroads NC where they also fought.
One source that no one has touched is post war veterans' reminiscences that appeared in South Carolina newspapers.
If you want to talk about the 5th at length email me at firstname.lastname@example.org