I have a few battery questions.

if you will use inverter to power them you will have back noises and distortion...

 

OK, Now I see the problem. Google Merl Haggard, George Jones, Mel Tillis, Charlie pride, and many more, but that will get you started. If you haven't already ruined your stereo playing that stuff, you can actually hear these guys real misic without blasting out your neighbors ear drums, and will not have to spend a fortune doing it. lol

Let the flames begin. lol

 

I wonder what the real sustained wattage draw would be. I believe a 1,000 watt speaker may draw that much on a peak, not sure what the average would be.
I heard a DJ years ago say he only used 200 watt systems for dances, but rarely ran it at much over 35 watts. A vehicle is a better environment for sound and may not require as much power to satisfy your needs.

 

There are a few issues with the sensitivity of a speaker unit, many times you don't need to drive them with a thousand million watts to make it loud.

 

I have burned two subs in my truck . ))) one of them with fire...

 

Maybe he is going to do Roomba classes at the truck stop. For leaner fitter drivers.

 

Wait, wait! 140 dB but don't park a reefer next me?

And do read up on tinnitus, you'll find it helpful in your future.

J/s