That's what I'm wondering but 12v would be fine too. Like say can you use a step-down and then use like 1-2 batteries to run the car/ mutli channel amps.
Oh from stepdowns to 12v batts? Hrmmm...thats a good question. Im actually considering running a couple kinetic 16vs in my XS 16v bank...that way you have the 12v posts for highs and car...not sure how well that would work, but ive seen people mix 12v batteries many times with no problems.
This is just advice from personal experience....... do not do that. Take it or leave it, but that is my advice to you.
in this did you mean don't use step downs to charge a 12 volt battery up front or not to mix the 16 volt batteries
Do not mix the batteries. The main purpose of the step downs is to allow you to run and charge 12V system.