yep, battery disconnect switches are not common on travel trailers.
and if you don't keep it plugged in, on shore power, the battery will be drained in just a few days.
with a new trailer, your converter/charger will keep the battery charged, if you keep the trailer plugged into shore power.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package