At any rate, the options are really:
1) 14 feet of 2/0 AWG wire handling 400+ amps
2) 14 feet of 4 AWG wire handling 90+ amps, plus an isolator, plus an additional deep cycle battery.
So if it's just a cost issue - seems like a wash.
Oh well - I just hopped on Amazon and jumped on this, everyone else should probably go ahead and do the same, never know when you might need some...