Think about this? You plug in your camper when you are camping. Not uncommon to have it plugged in while camping for a couple weeks at a time, or even longer. Plug it in at home for several days in a row, or whatever. What's the difference between leaving it plugged in 2 weeks, or all the time?
I park mine at home. It's been plugged in constantly since we purchased it. The only time it's not plugged into shore power is when we are on the road traveling.
Yes, check the water level in your battery occasionally. My last camper, in 8 years, replaced the battery in year 5 of ownership. NEVER added water. It never needed it.
Current camper, bought new, 4 years of ownership now. Added water once, last Fall. Levels still good. Plugged into shore power 24x7x365.
But, we do use the camper at home an awful lot. The question is, "not" how many nights have you slept in your camper this year? The question is, How many nights have you NOT slept in it this year. Answer .... maybe 28 the entire year. (The month of February when it wasn't feasible to heat it in the winter.)
Edit:
Now, if you are not using the camper at all over the winter months, then it makes more sense to pull the battery from the trailer, shut the trailer down, take the battery off, and just keep a battery tender plug in inside your garage or somewhere out of the way.
