Trojan T-105 Storage

You live in a perfect environment for battery storage.

The best way to store it is to switch it off circuit so there is zero chance of a fault draining the battery. Absolutely 0% chance of accident.

A battery maintainer that compensates for temperature is another must. This will reduce stratification to near zero. A maintainer with a potential of >1.0 amps would be my choice. The maintainer stays connected 24/7,

I take mine out of the RV and place them in a garage that stays above freezing; around 40 or 50 degrees. I then check the electrolyte for specific gravity and trickle charge to at least 1.27 and then disconnect from the charger and place a digital voltage gauge on it. (draws no power until the button for display is pressed) I check it for 12.6 volts and specific gravity maybe once or twice during the down time. I've never seen the voltage change from 12.6 or the specific gravity drop below 1.265.
I suppose it's overkill as just charging them and leaving for 3 months wouldn't have changed anything.

A Trojan ain't no different than any other L/A battree, despite what battery knowitalls would have you believe, Keep it fully charged, and it will last forever. And I myself would like a continuous float charge of 13.2 in warm weather

Storage temperature and frequency you’ll be able to check them and charge as required are important. I’d be reluctant to let them go more than 30 days without charging if they are stored where it is warm.

If they're under warranty, consult the manufacturer for best long term storage options.
Get a name, and/or record what's said, preferably in writing (by email).