It depends...
Welcome, and it sounds like a good plan for retirement...
As for batteries, decision to remove depends on your access to trailer and climate.. If it is really cold (below freezing regularly) and trailer will be left unattended for weeks at a time (like in storage..) then I'd remove batteries, keep warm and put on intelligent charger...
If temps not so cold, and trailer alongside house, equally effective solution is to plug trailer in for a couple days every other week or so, assuming none of the appliances or other internal loads are connected...
The two things best avoided are really cold temps for battery, and lengthy solitude, during which the battery can discharge to 25% or less of rated capacity.. Those will put battery at risk for shorter lifespan. Depending on model of charger in trailer, leaving it plugged in all the time might be waste of energy and overcharge battery, risking venting of acid and dry cells, which are also deadly..
Try using search tab above for "battery" and "maintenance" and "charging" and see what others have said...
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Condoluminum
In Theory, there's no difference between Theory and Practice, but in Practice, there is usually a difference...
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