MFL wrote:
When I stop for a short while, somewhat off level, for rest stop, or lunch, about a half hour, I always turn the fridge off, and back on prior to pulling out.
Same here.  During the season I park our trailer here at the house but always level it so I can not only use it whenever I want but also so I can fire up the fridge in preparation for the next trip.  When we're about to leave but 
before I begin my hitching up process I turn the fridge off and it stays off until we actually pull out.  Same at the campground - arrive to register and one us of will turn the fridge off and it doesn't get turned back on 'til we're on-site and leveled.  Same for mid trip stops along the way, whether to play tourist, have lunch, whatever - fridge goes off until we're ready to hit the road again.   When we arrive home fridge goes off until such time as I've parked and leveled once again - always.  I've followed this practice for years with every trailer we've owned and have never had any fridge issues at all.  IMO, better safe than sorry.