Really it depends on if you are playing the 3++ as being on the AV13 or not. If you are not pask punisher, lascannons, medusa artillery carriages, or rapier battery will all work well.
If you cannot realistically kill it with any ease you can use several bubble wrap units and trap the barge in a combat. Honestly tarpiting it in a specific unit will be mostly impossible due it being a skimmer but if you don't have a few assault speed bumps in your list you have bigger troubles.
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