As noted, leaving it plugged in is fine. People put trailers on seasonal sites and almost never move the trailer. Friends of mine left theirs plugged in for months - they had fridges stocked and running.
It it were me though, and I had my trailer at home, I wouldn't plug it in and would kill all power use via a battery disconnect. I was trained by my grandfather - "turn off that light, Edison already makes enough money".
I would have capability to plug it in so that I could cool down the fridge and top up the battery a day or so before leaving on a trip. It could also be valuable as a place to escape SWMBO.