The best trio I can recall at UGA would be, probably, Chubb/Michel/Gurley, but the first two were freshmen at the time. The best duo would be Chubb/Gurley, and they had D'Andre Swift with Chubb and Michel when they were seniors. Another duo of note would be Sinkwich and Trippi. It would have been rare until fairly recently to have three who got significant playing time, and today probably one or two would "portal".
I found these two trios mentioned on line:
1978 Auburn-Joe Cribbs, James Brooks, William Andrews-incredible
1996 Texas-Ricky Williams, Priest Holmes, Shon Mitchell. Mitchell is the fastest guy I have ever seen. Think of Ron Leflore with shoulder pads.