yeah my brother just bought a bunch of knukoncepts 0ga for his dual battery setup he's doing.
he's gonna be running his amps , and winch (its a off-road truck) off the second battery and use his starter battery just for the truck.
technically he doesnt need an extra battery (he only running a 500/1 and a 300/4) but he wants to make sure when hes chillin out in the woods that he dont go dead listening to tunes.
he bought a smart solenoid so the batteries are seperate when the truck is off but both get charged when its on. pretty cool setup IMO.