17 minutes ago, Megatronrex said:The only one that comes to mind would be the Viscount.
Actually, I found some more EU "canon" ships in a EaW mod called Awakening of the Rebellion. Apparently the Rebels got their hands on a Madator class dreadnought. Not sure which version, but the II was 8km, and the III was 12km. It's epic size, but not 1v1 a 19km SSD epic. Still, there were smaller SSDs made closer to 9km. It is possible to size both ships at 8-9km and give one to both sides.