I bought my current rig slightly used at nine months old and 4000 miles as that was the only way to get a rig with four slides and for what I knew was a good price of $250,000... original owner took a $40K hit and not from the MSRP of $370K as he had gotten 23 % off. At 10 years I insured it for $100,000 agreed value as that was what it would take to replace it. Four months ago or approximately at 13 years I cannot ensure it for more than $70,000 agreed value.
The easy math is $15,000 a year for 10 years and then $10,000 a year for the last three years depreciation. The better answer is $20K the first year of my ownership and then $1,000 less each year... $19, 18,17..... approximately 8 to 9% a year. Not a cheap sport if you only use it a couple months a year. Heck, not a cheap sport as half timers.
The good news is the next 10 years will be much cheaper to own it... even with possible repairs. Today if I was starting out I'd buy a 10 year old upper level DP... a lot of bank for the buck.
*OP, using my numbers and converting to $100,000 for the Bounder PLUS not including the first year hit the Bounder is worth less than $40,000. Even the real inflation rate is not going to change this reality.
