need opinion of actual players
It would cost 800 credits (ranger 500 + rocket soldier 300) and a bit of micro. On the other hand, the flak truck costs 600 and is ready to go.
You can't fix the light tank because he ain't broken. On it's own, he is fine and balanced. The problem is the medium tank, which always is a better choice. The only time you want to get a LT is when you can't have a MT like in the early game before service depot.
You can embrace that by making it upgradable from LT to MT or you remove the LT completly and replace with something else.