That's interesting. The HD200 "light" comes on every 1000 miles regardless of when you reset it. It's a mechanical gear in the ODO and is reset with your key like the older Honda Cars.
Does the RV do it every 1800 miles exactly or does it reset 1800 miles at the current mileage you have when you reset it?
It counts up from the mileage at the time you reset it, kinda like a tripmeter.
db