I contacted the company that makes the A/C units and asked them if they recommend covering the units and this is what they said:
Covering the unit would actually do more harm than good. A cover would trap in moisture that will adhere to your electrical contacts, causing them to corrode. For this reason, we strongly recommend that you not cover the AC with a winter cover.
Sent from my iPhone using Forest River Forums
Tom and Julie
2015 Rockwood 2703WS Emerald
2012 GMC Sierra Crew 4x4 1500 SLT Z71