Welcome to iRV2. Consider posting this question in the Monaco Owner's forum. On the iRV2 main page, scroll down to the Owner's Corner. There you will find a forum specifically for Monaco products. I suggest this because nobody knows your coach like somebody who owns one just like yours.
For me, I'd do nothing until you connect to 50 AMP shore power. 50 AMP shore power is really 100 AMPS available to the coach. 20 AMP power is just that, 20 AMPS. Regardless what the monitor says, operating your coach on a 20 AMP power source is a challenge for the EMS.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours