datboychevy
+1y
one bat would be fine, 2 relays, 8 gauge wire to the pair atleast... if you have a large audio system get a bigger alternator. imo another battery wont help when your truck is running.... if u have a 100 amp alternator and ur truck is using 130amps with the audio, comps(if ur hitting switchs alot), headlights, motor, and other elect. stuff... it gonna evetually go dead no matter how many batteries u have...
not trying to be an a$$. just trying to help, btw it would suck fabbing another batt tray.