I suspect you'll see just in this thread of yours, if some go into any kind of detail, that the term meltdown means different things to different people. For example I have rages too, but mine is more a PTSD response, which is a co-morbid that has hitched a ride with the AS. I've only had, what I consider the term to mean, 2 in my life. And both those required outside help. Anxiety attacks, oh yeah and probably some would consider those along with what comes with them in certain settings a meltdown or overwhelmed and they can be. I think some of it can be just due to what settings you find yourself in. In other words if you don't get around "triggers" you might not see any or very few. But I'm gifted enough to cause my own triggers too, hell of a gift isn't it? Again I think some of this depends on what "friends" have come a long for the ride. Bipolar is one of mine.
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Just enjoy what you do, as best you can, and let the dog out once in a while.