@Panzerjager: the T28 had live tracks. Regardless of what the face of the link was composed of or looked like, the design of "Live Tracks" had to do with bushings INSIDE the link which made it curl.
web.inter.nl.net/users/spoelstra/g104/track_vvss.htm
Look at these Sherman tread types. ALL were live tracks. The use of live tracks had to deal with how the suspension was designed -- and had nothing to do with whatever was the configuration of the link shoes themselves. They could be smooth rubber, rubber chevron, composite rubber/steel, all steel, steel cleat, whatever -- and all be LIVE tracks.
The T28 Assuault gun's suspension was designed for live tracks and thus, ALWAYS had live tracks mounted to it.