The maintenance is time OR miles, chances are the RV went in-service around a year ago and since the computer is saying you're 30 days overdue it means you've hit the time limit of 1 year and exceeded it by 30 days so far.
Oil changes/maintenance items aren't just mileage-based.
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2017 GMC Canyon - CCLB, 4x4, 2.8L Duramax, ARE Z-series shell
2013 Shamrock 21SS
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