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There is no one way to get this task completed.. You\'ll have to contend with the fact that you\'ll have to do many small steps to make a difference .  It\'s simply controlling the flow of  BTU\'s. ( British Thermal Units.) You want to keep the heat out in the summer. And heat in during cooler weather. We have an aluminum structure that is very good  at transferring BTU\'s. 1 1/2 inch thick walls that limits what we can do with insulation in those walls. But there are small things you can do to improve this situation.  With our latest 78 Royale.  The factory installed foam insulation was fairly well done.  Thought of having more foam installed, but a person that does foam suggested that I use the foil bubble wrap product.  Due to that so little additional foam could be added.  So I taped in the buble wrap in the walls, then went looking for other areas that improvements could be made.  The cabinet that our refrigerator are in keep the back of the frig exposed to the outside temps. So I added  3/4 foam insulation to all cabinet  surfaces.  Even up to the roof vent. Then installed a good seal to the outside walls. Next I wrapped all furnace ducts. There are two that go under the frig that I double the wrapped.  As you can see in the photos, there is no reason to insulate the back outside wall of the frig cabinet.