Roma is 140 kms west of Miles. Chinchilla is around 70 kms east of Miles. The Warrego Highway is open from Roma to Miles but closed between Miles and Chinchilla.
Roma and Miles were not flooded although the creek rose a little at Miles. The flooding starts further east at Chinchilla and south at Condamine. Miles had some flooding earlier in the December floods.
I don't know the Miles airstrip but believe it will take an RFDS King Air, so a PA31 should fit. I think the AAE - GAM Shrike freighter goes in there each day.