The 2007 Lego MTT
The Multi-Troop Transports also known as MTTs were heavy repulsorlift vehicles used by both the Trade Federation and the Confederacy of Independent Systems to transport B1 Battle Droids and other mechanical infantry prior to and during the Clone Wars. It could also be used as a battering ram. Qui-Gon Jinn and Obi-Wan Kenobi hid in one to escape the Trade Federation ship.
The MTT was made by Baktoid Armor Workshop. In the canon Star Wars universe it could carry up to 112 Battle Droids, but the latest Lego® model could only carry 16 droids and a Droid Carrier (excluding 2 Pilot Battle Droids, 2 Security Battle Droids, and a Droideka).
Game version
A stuck MTT as seen in Lego Star Wars: The Complete Saga
The MTT as it appeared in Lego® Star Wars: The Video Game was a smaller version of the MTT that only appeared in the game. It had a hatch in the back as well as the front.
Appearances in Lego®
Sets
There are currently 3 different sets of MTTs: