Keep plugged in or disconnect battery when parked

Seems to be the hot topic of the week.

Stay plugged in in storage?2007
disconnect? Oct 2013
Stay plugged in Mar 2014
Stay plugged in Jun 2014
Stay plugged in Sep 2014

What does the owner's manual have to say? I have a 5th wheel that I keep plugged in for weeks on end.

With my truck camper I kept it plugged in 24/7/365 when not on the road. With the Class C I have a "small" solar panel that keeps the phantom draws in check but just so I leave unplugged most of the time and maybe once every month or two will plug in for a day or two just to help the solar keep up.

What type of converter do they have? How long are these periods of non-use? How conscientious are your friends about checking the battery electrolyte levels and topping up if needed? Is this during the summer or winter?

In general, keeping it plugged in would probably be better, but there are very many variables. Other good options include setting up a timer to power the converter for a short spell each day (say maybe an hour) or connecting a decent little maintenance charger and not using the converter while stored.

Plug it in. Still need to watch battery voltage drops to what you expect within a week and that water level does not drop too low. Should not be a big issue in Winter.

We have 2 AGM batteries that self-discharge very slowly, perhaps 1% per month. As a result just disconnect them with the battery disconnect switch and leave the rv unplugged between uses.

I keep my Class C plugged in 24/7/365. During the winter I turn the converter off and use a Battery Tender to maintain the battery. I have a 3 stage converter but I prefer the battery Tender. I have found that my electric bill is less with the Battery Tender.

I found it best to disconnect our batteries, but our rig is stored indoors.

Disconnect and add a modest solar charging system.

If they have modern multi stage converter then I suggest they keep it plugged in (same as you). I suspect their Class C doesn't have the ability to maintain the chassis battery when connected to shore power - if so they should invest in Trik L Start (inexpensive and easy to install).