Put duct tape around the seal of the fridge to extend the thaw time. Did this on an igloo cooler with ice in it, put it in our canoe, put gear all around it and on top of it, opened it once a day to take the evening meal out of it, and still managed to keep ice in it till late on day five of a ten day trip in Utah. If putting a blanket on top of the items BEFORE shutting it up, remember that the blanket was at the ambient room temperature before putting it in the freezer. It would be helpful to have the blanket as close to the freezer temp as possible before storing it.
If needed, take a picture of the loaded freezer and refer to where everything is before opening the door, as this will help redice the time needed to get it out.