The heavy artillery platform was a far more powerful version of the Imperial mobile artillery.
With its larger cannon, it could fire more volleys and was tougher to destroy, but it also had to deploy and un-deploy, thus making it more difficult to use effectively in a heated situation. An alternate version of the heavy artillery featured a heavily-armored, slow-moving repulsor frame with two large mounted cannons.
The heavy artillery platform was a far more powerful version of the Imperial mobile artillery.
With its larger cannon, it could fire more volleys and was tougher to destroy, but it also had to deploy and un-deploy, thus making it more difficult to use effectively in a heated situation. An alternate version of the heavy artillery featured a heavily-armored, slow-moving repulsor frame with two large mounted cannons.