We just sold our 2014 X23B. Paid $20k for it brand new, but dealer offered $13k as a trade-in which would have made negotiating the price for our new trailer almost impossible. We put it on Craigslist for 2 months and eventually sold it for $16k. It's definitely worth it to sell it yourself.
2016 Jay Flight 28BHBE Elite/Thermal/15k AC/Equalizer 12K
2016 Ford F-250 Lariat Screw 6.2 CC 3.73 gears
2014 Feather Ultra Lite X23B (2014-2016)