This will only be of help if you've got a Canadian Tire in your vicinity, but if you are looking for some 6ga red and black wire to run your main power lines, I see that the latest Canadian Tire flyer says that
these booster cables are going on sale for half price this week.
They've got to be more flexible than the 6 ga wires supplied in the KoP (unless there is some flexy new wire in there this year, that is...) and 12' should do you for a couple of robots.
Jason