TRG300s are only 585 kg with the warhead of 105 kg. I guess Roketsan will produce a new rocket with a bigger diameter and weight. F16s can carry 2 * 1000 kg rockets. In that way we can easily exceed 500 km for ALBM class.
It's like Iranian new Hayber missiles with 2000 km range. Actually it is not so short. The closing shooting and its relatively thick form makes it look short.
Arat contract was signed in November 2021 and it was a 40-month long contract. Arat engine is ready I think. We will see it very soon. I expect 4.2-4.5 N engine.