Still a great and reliable vehicle in my opinion..Id just do the 2 batts, and the Big 3, and It should be just fine.You will know when driving if you loose power or it cuts in and out.. thats when you need to do that bypass.But 2 of those batts, and You should have plenty of supply to maintain a decent 2k-2500 rms sub stage.One batt under the hood isnt going to get it done period.I cooked a couple great amps from low voltage over the years but learned that I needed power to supply power. thats why Ive always said .. It takes power to maintain power