another way is to just add this trigger:
| Trigger |
| Description: |
| no normal tanks |
|
| Conditions: |
| ¤ Current player brings exactly 1 Siege tank (Tank mode) to 'Tank' |
| Actions: |
¤ Remove 1 Siege tank (Tank mode) at 'Tank'
|
¤ Create 1 Siege tank (Siege mode) at 'Tank'
|
| ¤ Preserve trigger. |
it gives the tank a lil down time from shooting because it makes the tank go into siege mode all over again, but it still works.

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Move Location Tank to Siege tank (Tank mode) owned by Cur. Player at Anywhere