The odometer in my current DP Motor home was replaced a year prior to my purchasing it. When I bought it the replacement was disclosed and I received the old odometer which had the technicians name, date removed and mileage recorded... the new odometer also has a sticker with the technicians name and date installed. Whenever I have service done at a dealer the mileage reading that I give them is the old mileage plus what's on the the new odometer. Should I ever decide to sell, I'll disclose the replacement and give the old odometer to the new buyer.
FWIW... the first time I had my Motorhome serviced at a cummins dealer the service tech pulled up a maintenance history, by vin/motor number and replacement of the odometer was noted along with the date and mileage info from the original odometer. I know that cummins and freightliner both keep a running history of repairs done by authorized repair facilities... perhaps the unit your looking to buy will have a similar history available that you could check out.
