What is the biggest battery I can find for car audio?

I want a battery with REALLY HIGH amp hour ratings.
I’m thinking about an XS power battery. It puts out 125AH i believe.

But here is a thought. What about a group 8D battery. Batteries used in buses and big trucks. There AH range from 225-255?
Is there one made for car audio purposes so I can safely put it in my trunk and feel secure knowing that it wont leak acid in the trunk?
 
Just use more than one in parallel. You can get as much current as you want.
 
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