Yes, there is a battery disconnect switch, and if your floor plan has a couch in the front, it is most likely under the couch when the big drawer is pulled out.
If your tongue jack works only when the trailer is plugged into the tow vehicle, your trailer battery could be totally shot, or disconnected.
"The further a society drifts from the truth, the more it will hate those that speak it." George Orwell
'08 34' SO, '12 Ram 2500 4X4, Big 6 cylinder sludge burner.