Longer tubes are possible, offering better ballistic performance and longer range, since rounds don't have to be drop fired from the muzzle; longer barrels can also obviate the necessity for muzzle blast devices for crew hearing protection. Fire at lower angles of elevation is possible, including direct fire,[as with the improved US M19 60mm] making largebore mortars particularly useful in urban fighting/MOUT, and autoloaders are possible, as with the 4-shot Soviet 2B9 82-mm Vasilyek mortar found in both a towed/wheeled and MTLB tracked vehicle mounted version or can be mounted and transported in the cargo area of a modified GAZ-66 (4 x 4) 2000 kg truck.
There's also a similar 120mm MTLB tracked mortar carrier, not fitted with an autoloader- yet:
