If I were selling it, the first thing I would do is see my local Bank's/Credit Union's Loan Officer. I would ask what is the loan value and what is the wholesale value and if he has it, the average retail sale of the unit.
NADA is only a nationwide average and that may not reflect your area.
Then realistically look at condition while writing the ad.
Then research local media as to sales. The loan officer may also be of help here.
Now do you want to sell it fast or get the last penny you can?
1-Everyone likes a "deal" so if you want quick sale, the most attractive price always gets sold first. What can you live with on the sale?
2-If you want only the highest price that you have found sold, then you will most likely be waiting for that "one special buyer" to show up.
3- If you can make a decision that it is realistic to be between # 1 and #2
with an honest ad, you should have no problems selling it in a reasonable time-frame depending on the economy in your area. If the economy is bad in your area either you will need to lower the price or count on an out of town buyer.
Best of luck.