And it will be for a long time if you don't learn how to promote it better
Seriously, you need to post lots of pictures and mention all the upgrades, condition of unit and tires, mileage, full time or occasional use, ect. The more info provided the better, unless it's bad info. Tell about how much you like certain aspects about it, how much you have enjoyed it, how well it's built or how reliable it's been. If you have a current add somewhere supply a link to that site. One other thing, when it comes to selling used, cleanliness is next to Godleness! At a minimum post an asking price and a phone number or email.
PS stating must sell is an invatition for lowballers.
Good luck.