On our TV, the electrical stays charged when the engine in off---So, I disconnect the plug to keep the TV battery up. I also, drape a glove over the steering wheel when I do this to remind me. Once in a while, I do drop the front legs to stabilize the rig, but usually just level it with a couple wooden blocks if we're just overnighting it. The glove on the steering wheel jogs my memory that something needs to be checked before leaving.
It has worked so far.