my 2 cents:
arty should be a combination, especilly in lieu of the terrain.
so the 3 "T's" for me, towed, tyred and tracked... balance should also include MLRS using all up rounds, guided and unguided.
an all up will allow the MLRS stacks to be used on 8-15 tonne flat top trucks as well as dedicated vehicles.
as has been discussed by others as well, and has been demonstrated by the Russians in WW2, the US in Iraq, MLRS is an ideal armoured vehicle killer..
MLRS will allow long range strikes on armour thus forcing the opfor to have UAV's up and running, thus also demonstrating presence and probable intent.
I'd be interested to see what Awang se says as they are using battlefield rockets in Malaysia, so similar operational doctrine overlap.