2021 [email protected] 320S BD -c Dual Lithium Batteries installation

Hi..., We are scheduled to pick up our new 2021 [email protected] 320S BD next week and were already wondering about the installation of a dual battery system with the existing solar package that comes with it. A few questions we have associated with that:
- With a dual 12V lithium battery sytem in parallel, do we need to change the Victron controller that comes with it in order to allow an efficient charging of the two bateries?
- If so, any recommendations on which controller?
- Are battery boxes needed/recommended inside the tongue box?

Thanks in advance for your and comments and help.

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