I assume you saw this faq on their website:
Why is frost on the interior cooling fins only on the right side?
It is normal to accumulate frost on the right side of the bank of cooling fins. The coldest part of the cooling fins are those on the right side of the refrigerator as viewed from the front. Gas/Electric refrigerators will build frost of varying amounts depending upon the environmental conditions (temperature and humidity), how often the doors are opened, and what is stored in them. Defrosting is not required until a decline in performance is noted. Refer to your operator's guide: "Defrosting and Cleaning the Refrigerator Interior."
2016 3500 6.7L DRW
2010 Starcraft 329BHU TT