Denn'lar class

The Denn'lar class was a type of armored transport fielded by the Klingon Empire during the 24th century. 

The ship consisted of a trapezohedral hull with its nacelles pulled in close to the hull so to minimize their vulnerability to attack. It was capable of entering a planet's atmosphere and landing on its surface. It had large doors on its sides that folded out to form ramps for quick deployment of its carried troops.

Entering service in 2363, the Denn'lar became the main troop transport of the empire.