I just purchased a new 2015 RV and before delivery we did a quick walk through. We found a few issues that the dealer fixed, they told us to take it out for a weekend and make a list of all the thing...
Your warranty should start after you bought the RV and the mileage after it got to the point of sales. I know I got my from an estate sales and in the paper work it showed the mileage to the point of original sales and that is when the warranty started to the first buyer.