Kandosii-type dreadnaught

Mandalorian Dreadnaughts were capital ships used by the Mandalorians some time prior to 100 BBY. They were possibly the same as, or based off of, Mandalorian Dungeon Ships.

A notable flaw in their design was that their hyperspace navigation systems could be crippled by a strategically-placed charge in the rear.

Sometime prior to 100 BBY, Rendili Star Systems adopted their design to create the Dreadnaught-class heavy cruiser.

Behind the scenes
The reference to the Dreadnaught-class ehavy cruisers being based off of Mandalorian starships comes from The Dreadnaughts of Rendili; combined with Palpatine's statement later in the comic that the heavy cruisers would be turned into dungeon ships, it was clearly intended to show the development of the Mandalorian Dungeon Ship from Dark Empire.

However, the History of the Mandalorians article later made the dungeon ship specifically a separate ship class.