The canonical cousin of the fan favourite XG-1.
The DX-9 is an armoured, shielded and heavily armed transport craft designed for boarding operations and used as a dropship.
Capable in an assault and support role, this thing would likely have a worse dial than a shuttle, but would make up for it by carrying at least two torpedo slots. In the X-wing series of games, these things have wrecked face with their torpedo's more than once, and can even disable craft with ion cannons.
Like the Lambda class shuttle they are capable of carrying some 40 Stormtroopers.
This ship not only appeared in the X-wing series, but also in Mysteries of the Sith, where it landed at a Rebel base, deploying Stormtrooper squads.
http://starwars.wikia.com/wiki/Delta-class_DX-9_stormtrooper_transport