I am going to do an install in my Chevy Avalanche this summer with 2 18" BTL or SP4's. Running on 2 RF T2500 amps. Was hoping for advice on what kind of power I need? Should I upgrade to a DC SPX300 alternator or get a dual bracket kit with a less powerful alternator? Replacing the hood battery with a XS D3400, will that be enough or should i get 2 D3100 to power the amps too? Capacitor? Thanks for any help.