largest group size battery

[zapc]

im looking to get a new battery, I believe stock is group 78, anyone know largest I can get to fit stock tray>.
its a 97 tahoe, saw the question asked a few times, no one answered it. also truck came with the second battery tray installed, so I may also do the dual battery and isolater. lots of info about that, if anyone got a particular route to go please let me know

 

[Eric1998]

I went with two AMG 34 batteries (no isolator) from AutoZone.
I have no complaints or regrets.

You must be registered for see images attach

 

[zapc]

I think I want to do an isolater so if I kill main battery when camping etc,,, I can still start, thanks though. I imagine you need or should run exact same batterys when running in parallel like that so they charge properly?

 

[Eric1998]

Gotcha, yes I did, got them from autozone.