There is no such thing as a "bomp proof" bicycle wheel. Hit something hard enough often enough and you will distroy any of them.
However, as dabac said, the impacts you mention do usually dent or taco a wheel, not cause spoke hole cracks or pull-through.
Who built these wheels and was the spoke tension proper when you got them or was it ever checked? Were the wheels retrued after one of your impacts which could have resulted in very uneven spoke tension?
OP's aren't the worlds most durable rim but anything should last more than 5000 miles if properly built and not abused too badly.