A while back I was desperately trying to do what this system does/provides.

 So my dad just asked about clearing a 6′ slab for a water line and I looked again and it’s now available.

Here’s some press release   http://news.thomasnet.com/fullstory/497334

some extensions and such from amazon http://www.amazon.com/Hitachi-725784-43-Inch-Rotary-Extension/dp/B000M9J40G

The thing that makes this go is the 725780 adapter which joins the two sds max ends with no loss of power.

Just cool to know it’s out there.