I would generally agree with your line of thinking that, assuming the same make/model, two motorhomes of different years will roughly lose a similar value over time. That said, I think the loss over five years will be much greater than $35,000. For example, RV Trader currently shows 2019 Phaetons (42') with asking prices around $269,000. A 2014 Phaeton (also 42') is around $175,000. As of today's date for the same motorhomes, NADA shows the 2019 "Average Retail" at $227,950 and the 2014 at $178,850. Of course, these are just rough numbers as there are many variables (condition, mileage, current market price, etc.) to consider. A rough number I use for class-A motorhomes is a value reduction of $15,000 per year. So in five years, I would expect the value to be reduced by $75,000. It must be stated that this is just my opinion and, as they say, your mileage will vary.