How about a Yobuck squad? Assuming you avoid open areas, a Yobuck squad is deadly against Mandalorians. I use two, both work fairly well. (They are both 200 points squads, but you can expand them)
Yobuck bacta tank squadYobuck Rodian Trader squadNote that I made the first squad before I had cheap characters (i.e. ugnaught demolitionists) which you can add it to increase your activations. I will probably edit it now that I have better characters.
After two rounds, you should be able to kill everyone with 60 HP or less and at least one bigger character (using General Skywalker and Yobuck=180 damage to one character)