Purchased 2017 Northwood Artic Fox.  Currently winterized.  We added the following factory upgrades totalling $17,048:  
16 Gal Quick Recovery Water Heater
42" LED Smart TV with mount in Living Room
39" Surrund Soundbar Living Room
Alumaguard Main Awning
28" 110V LED Smart TV in bedroom
FAN-VENT W/Rain sener/Therm/Remote (bedroom)
Fireplace
King Bed
5.5 Onan Gold LP Generator
6 pt Lippert auto leveling system
Cross-Stitch sofa 76" w/Air Matress 54x74
Rear View Camera
12 Cu Ft Fridge with Wood Panels
4 exterior steps (dealer installed)
Other additions:
Progressive Industries HW50C Hardwired EMS surge and electrical protection 50 amp
2" rear tow hitch on back of RV
DVD player in bedroom
Door grab bar on screen door
Metal Screen Protector for lower front door screen
B&W Companion 5th Wheel Trailer Hitch

New Retail value of the trailer was $92,523.  It's still in like new condition.  We used it for less than 12 trips (all within 600 miles of home).  Smoke free.  Fully set up to start camping today!