On my old Puma Unleashed I installed a battery disconnect also. Got sick of flat dead batteries only 2 days after a trip. Just got in the habit of unhooking them at the same time I shut off propane tanks. All my batts always get pulled in winter and stored in an insulated room in my shop on a Tender charger throughout the winter. Using this method allowed me to go 5+ yrs on batteries. The disconnect was protected in the battery box.
I do this on my boat, RV, ATV's, lawnmowers, etc etc.
The new trailer has a disconnect already installed or I would do the same again.