Freightliner chassis? Yes, it's possible they reset. My odometer has reset twice on my RV. I think it's reading about 2500 miles right now and that's a 10 year old motorhome. Per Freightliner there is nothing they can do to reset the odometer to it's actual mileage. However, the onboard computer system does keep track of the real miles. Last time I had my RV into Freightliner for service I tried to get them to get me the real miles and they were unable to because they didn't have the right plug. I understand there is also a way to get the real miles out of the trip computer but you have to call Freightliner and they give you some code to access it.