Never looked for where my frig plugs but I do like to disconnect the power. For me, the easy route is to flip off all breakers that are not feeding things I want left on. The frig is usually on a different breaker than other things.
I had this idea that I might be able to head off some trouble and one item I have had is rodents chewing things like wiring, so I like to have as few fire starters as I can manage when I put it down for storage! I also throw some rat bars into most any space that looks inviting but then I still find the little creeps get into places I don't expect them.
If you don't have an actual main battery switch (most Winnies do) then it's a basic part of winterization to disconnect the battery entirely before storage. There should be no need to turn off the fridge separately.
We have a '14 38Q. Yes, as others have said, open the access door from the outside of the MH and reach in to your left and the outlet will be there. I had to find this quickly when we had an electrical fire in the main distribution panel under the bed. We were a couple of thousand miles from home on an extended stay so refrigerator full of food. We just plugged the refrigerator directly into the campground post until the distribution panel could be replaced.
2014 Winnebago Adventurer 38Q
2017 GMC Acadia Toad
'09 BMW R1200RT/'02 BMW K1200LT w/Hannigan car