Probably wouldn't hurt to clean and reseal. This may be the last time you have it out.
Is the plug magnetic? Did you see and evidence of metal shavings?? When I changed mine I used a white 5 gallon bucket to catch the oil and then when I transferred it to smaller jugs looked for any metal. I think I did my change at ~80K miles.
I've only heard of one Monaco with a ring and pinion failure, it isn't common but does happen, and is expensive when it does.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi