I park my fifth wheel by the house and keep it plugged in to 50amp all the time. I covered it a few weeks ago because I didn't plan on using it for a month or so and the sun just beats on it. I didn't...
I'm thinking that blocking the outside frig vent could cause problems. I wouldn't do it. If you are going to take the time and effort to cover your rig, why not just turn the frig off.