I can see siege weapons used defensively - immobile national units, somewhat like Watchers, except shooting stones and bolts... in addition to the free ones from the castle towers.
According to Wiki:
Quote:
Used throughout antiquity in both the Far East and Europe, siege towers were of unwieldy dimensions and therefore mostly constructed on site of the siege.
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[/quote]Catapults were usually assembled at the site of a siege, and an army carried few or no pieces of it with them because wood was easily available on site.
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Most of the other articles don't say. Trebuchets were almost certainly immoble. Battering rams are so simple that they were almost certainly built on-site. But the article on ballistae seems to indicates that there were various types, some boat-mounted or even wagon-mounted. However, those aren't really siege artillery IMO, so much as anti-personnel artillery.
Quote:
The stone projectiles themselves varied in size, and could cause immense damage to city walls in their way, while the arrows could kill several men at once.
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I suspect that the mobile ones used arrows and the ones that used boulders were strictly immobile... but, I don't know for sure.