Its not designed for 6010, though you may be able to get it to run at higher amps, but control won't be as well. Geezer is right about using 6011, it will run better.
I would not go over 50 ft, though that isn't necessarily the limit. We have customers using the PowerArcs with some pretty long set ups. The longer the cable, the heavier the gauge. I'd go with #2 or bigger for best results.