I’d like to see a mobile AAA unit with short range radar that a player could place anywhere on the map provided it wasn’t more than X miles from a friendly base and no closer than X miles to an enemy base. Once placed it could not be moved for 15 minutes and once destroyed could not respawn for the same time limit.
It would be similar to the existing 5” ship guns but smaller. Say around 90mm. The radar range would be about 10 miles.