Do I need a battery cut off switch?

1L243 wrote:
When not in use, I plugged the trailer in at home. I got into the habit of unplugging till the batteries dropped down to about 12.4 volts then I would plug back in for a few days.

Now we are on the road for an extended time and spending a lot of time at RV parks plugged in all the time. Should I install a battery cut off switch? I have recently checked the acid levels in the batteries and they are full with no evidence of overcharging. My converter goes into trickle mode when fully charged.

Your converter's trickle function at the CG should be safe enough to prevent 'cooking' over a few days.

Counter to what has been said, I think what you are doing at home is the right thing, also. A former student who was an electrician for 20 yrs told me some years back that exercising the batt like you are doing at home is better than keeping them on constant trickle for long periods.

So, I assume, keeping them at a sustained full charge by disconnecting is not as good as having a small drain that you periodically 'bump up'