Artillery crawler
From Wookieepedia, the Star Wars wiki.
The artillery crawler was a self-propelled artillery unit used early on in the era of the Galactic Empire.
These crawlers saw use during the subjugation of Kashyyyk in 19 BBY, where they fired airbursts against Wookiee aircraft that harassed the invading forces.
Judging by the name 'crawler', these vehicles were tracked.
