It sounds like the AH goes in cycles - something stressful happens, he drinks more, it reaches some kind of crisis point (e.g. he hits you), he "behaves" better (e.g. he gets counselling and moves back in, he says he'll take Antabuse), and then when the next stressful thing comes along, he starts drinking more again. I can only see this cycle getting worse.
You can't do anything to stop the cycle because you can't make him develop better coping skills for stressors, which will always be present. You can only decide how you are going to respond when the cycle gets going. I think it is a very good sign that you aren't letting him back into the house. He may be out in the mobile home trying to wait you out, expecting that eventually you'll give in and say "okay, come on back". Do you know if this is what you want to do?
It sounds like you've suffered a lot from this man, but you and your kids' well-being is more important than he is.