So basically sling an artillery piece under a Cobra VTOL, or in a small craft or dropship and move from hilltop to hilltop, or standard Air to Ground Fire Support missions, with ASF's, dropships, and warships.
Maybe a Leopard or Confederate version of a Fortress, Remove some cubicles and mount some Long Toms or Arrow IVs. As much as warships vary from one another today I would assume that there are many variants of dropships we don't even know about.