Convenient timing for a thread on batteries! I am looking at options to upgrade my battery capacity, but the custom battery tray is pretty limiting for putting in anything bigger than a group 24 (would love to fit a 27 or 31). Has anyone fitted anything different than two 24s?

If I was to change the whole bank out, I would consider a Group 31 AGM house battery, and the smallest size AGM starting battery with enough CCA to comfortably start the 2QM when cold (400ish CCA)
Unfortunately I have a perfectly good Optima Bluetop 24 that is too good to switch out at this point, but is too big to fit a larger house battery beside. My other option is to tie two G24 together in the tray and mount a small starting battery on the side of the tray or elsewhere.