Owinsmom, I understand what you are saying regarding NADA or Blue Book values.
Dealers do not use them to determine a value for themselves, they use what's called a dealers Black Book to determine values.
What happens is people try to trade them in and get so low balled they yell "YIKES" and then try to sell them privately for more money. As rv age, the value is determined by condition and that's what yo need to base the price on . RV's are not investments, depreciation value is horrible.
As said, there are 'too many bad ones' being unloaded right now and very well might be dried out and unloaded . Living in S.C. , unfortunately you are probably well aware of this. Part of my family lives in S.C. I hope you stayed safe and remain safe.
a 2011 unit has 7/8 yrs of age on it, regardless of miles. With that age and 24k miles says this unit probably sat for long periods of time, not being used which isn't always a good thing especially if rodents decide to nest somewhere and do intermittent electrical damage.
Things begin to break down over time and is also true in the rv world. The 5 year mark seems to be the magic point where issues begin to rise, generally speaking.
If you have to pay out of pocket to an rv mechanic, you are talking over $100.00 plus (i've heard some places are up to $175.00) an hour and those hours turn into days and sometimes weeks to make a repair. I had one drag on for 6 months, all apart, while taking up a bay in the shop. Thank goodness that was between the repair shop and the rv mfg. under a warranty repair.
If you are new to this, I would hire someone to do an inspection of any rv you plan to buy . IMO, it could be money well spent. They know how and what to look for.