Make Shellers huge for balance reasons. There you go, land ship. Even though the Cybrans were my first and favorite race in SupCom, no. I would much rather they make naval useful first, primarily by making air less relevant on oceanic planets, not perhaps by overly buffing the AA capabilities of said field, but by making wrecks sink/pathable or making subs so one needs a waterborne counter. Then we can talk about ships walking on land!
https://forums.uberent.com/threads/suggestion-a-cross-land-sea-ship.60858/ https://forums.uberent.com/threads/its-time-to-talk-unit-ideas.52165/