Y-85 Titan dropship

The Y-85 Titan dropship, colloquially known as the walker dropship, was an important dropship used to deploy AT-ATs, prefabricated garrison bases and AT-STs onto planetary surfaces.

Characteristics
The Y-85 could accommodate four AT-ATs in addition to four AT-STs. Walkers were held by cranes, clamped along the sides, in battle-ready configuration, and could be quickly deployed via drop-down floor hatches. The Y-85 was armed with two forward twin laser cannons for defense.[1] The walker dropship could also be used to deploy AT-AT swimmers and TIE fighter boats straight into any body of water.

Because of the Y-85's size, it could only fit inside larger Imperial ships. The launch bays of smaller vessels, like Star Destroyers, could only hold landers like the Theta-class AT-AT barge due to their smaller hangar apertures.