IMO surfboard is utterly pointless of all fronts.
* No land unit on top of a water transport will Be as effective as sea units...
* If transport dies, unit drowns...
* Looks silly as hell
* water only transport is silly when air transport is cheaper, faster, and can go anywhere... and still silly because of clunky usability.
* Hovers or amph do the sea > land assaults, so no reason to bring tanks or vehicles...
* Cost is unbalancable, Either it makes a unit way to expensive to deploy in this fashion... or its so cheap that surfboard becomes the next scout/damage tank... or if surboard gets HP nerf then it's even more useless as a combat transport.
I think that
maybe if it did something silly like generate shield (only when a unit is loaded) for like 20 metal, as well as transported unit takes ALL damage until it's destroyed... maybe it might be used once a century in one game...
But then its still silly as a design decision, why would putting a land unit on top of a sea unit be better than building a sea unit?
If we do keep it, it needs some major love...
For your enjoyment: