The UBX-4593 "Ball" is just one of the cargo movers that can be seen in and around the spaceport. These heavy lifters can either be manned, remotely controled, or have AI Droid intelligence systems fitted. They are capable of working both in planetary atmospheres or in zero gravity.
Some models have also been armed, either with dual lasers or with heavy bolters. Though slow, the heavy armour of the Ball was designed to be able to withstand great pressure and is therefore a difficult target to damage, making this vehicle a favourite of some rebel or bandit groups.