Best example may be the ol' Redskins. Slow, heavy, white RB (Riggins) unstoppable behing the Hogs. Decent but not great QBs (Williams, Rypien) winning Superbowls.
Heck Timmy Smith still holds the SB single game rushing record and that was his first NFL start.
Williams was a good QB.
Rypien was a complete one hit wonder :)