11 feet should be more than enough man, 15 is a TON for the big 3, unless you're doubling runs or running dual alts/bats, or have a Hummer. Just a heads up. I measured mine out as best as I could and got 8 feet to be safe, ended up using 6 of it.
I can get some. Or 15ft of some unknown brand but its tru 0wg ofc wire.. Brand new still on spool for 30's shipped.
25 for 10ft shipped. Red or black only.