Battery Maintenance While in Storage

I am new to RV'ing and have recently purchased a 2018 R-Pod 180 with solar.  I recently built a garage for it at our place in New Mexico.  Considering that I may have to store it in this garage for 3 or 4 months unattended over winter, would it be better for me to plug my R-Pod 180 into a 110 outlet to maintain a constant battery charge or would it be better to disconnect both batteries (I have two - one is for solar)?  If I do leave it plugged in, should I put it on a timer so it will only charge a few hours a day?  I am not sure if this R-Pod 180 has a trickle charger or whether even if that would still be safe to leave plugged in unattended for 3 months.  I have googled this topic and have gotten a lot of varying answers.  Some say even trickle charging causes the fluid to dry out and get sulfate deposits.  Also, does this R-Pod have a battery disconnect switch somewhere or is removing terminals the only way to disconnect power if I decide to go that route?  Any insights would be appreciated.

Couple things, many of us do have battery disconnects we have installed. From factory it does not come with that. Personally I think any charging warrants a fluid check. The pod has a 3 stage charger, I would NOT leave it unattended for 3 months, I know I check my fluids monthly and I have a 30A power point my pod is plugged into here at house. I would remove battery and take it with you for charging when required, if the pod will be unattended for months.

When not using our Pod, it stays plugged in @ home with converter on. Over the last four years, it's worked just fine and my batteries are still in good shape. Your converter is a 3 stage charger. Simple.

Mike, I do. Maybe twice a year.