Jon Pontecorvo said:
Dunno what dirt jumps you've been riding but they can't have been good to be that solid.
Anyway i used to ride dirt on one of those funny bmx style scooters (after shoving hellafast bearings in it). But the way i'd do it now(which i'm considering for the summer) is getting some of those crappy looking air wheels, putting pedal-pins in my deck (to replace griptape[because that would be useless where i'm intendiing to ride])... Then just re-inforcing like mad.
Other things you could do are plug the holes around your deck so you dont fill them with dirt, barends are always helpful for that too.
Still someone making a good one would be interesting.