Earlier I posted saying that I didn't think that a matchup of 1 Trooper (w/Enhanced Engines) and 1 Transport should have a 51% chance to beat 1 Hunter.
So I decided to test it against Watser. the first attempt was one transprt versus one hunter. The hunter seemed to win easily, but it foe a few free shots in because I hadn't ordered my Transport to attack it, so its AI very sensibly thought to run away.
The second attempt I sent a Trooper and Transport together, explicitly ordering them to engage the Hunter. The Hunter made short work of the Trooper, then started on the Transport. The fight actually ended in a draw, as their final shots finished the other off.
In conclusion, I was wrong, 50-50 odds for a Transport + Trooper versus a Hunter are probably pretty accurate.