Does anyone know where to get a really strong Chipper from - I do lots of pruning and like to mulch the result - the green stuff gets chopped up with my mower but I want something a bit stronger for the woody stuff. To tell you the truth I'd really like one of those giant ones on the back of the council trucks that chop up tree prunings - but thats a bit over the top !!! Most of the regular ones are too flimsy.