I currently own a 1990 Sooner 3 horse slant stock combo, has a carpeted and paneled dressing room, screen door, 3 tier saddle rack, bridle rack.  The horse area has an place for a rear tack, but it didn't come with it when I purchased it used.

Can anyone give me a ball park figure on what it may be worth?  I'd like to sell it and upgrade to a different trailer.

Why don't you check the past sales on this site, may give you an idea.  Is it all aluminum, alum skin?  need more details and you might get some responses. Condition of the trailer?  height, stal length, etc

The trailer is all aluminum, height is 6'6", inside width is 6'6".  The trailer is in very good condition - pictures can be seen at:

[IMG]http://i14.photobucket.com/albums/a343/casey5237/Trailer/th_Exterior-rightside.jpg[/IMG]
[IMG]http://i14.photobucket.com/albums/a343/casey5237/Trailer/th_Exterior-leftside.jpg[/IMG]
[IMG]http://i14.photobucket.com/albums/a343/casey5237/Trailer/th_Exterior-front.jpg[/IMG]
[IMG]http://i14.photobucket.com/albums/a343/casey5237/Trailer/th_Exterior-dressingroomdoor.jpg[/IMG]

The low height is an issue as most people are looking for 7'+ and I personally won't even consider a trailer unless it's at least 7'.  (Course mine is 7'9" and wish more trailers were that height).

It's also a stock model, no frills, and 15 years old.  I would guess maybe $5,000 but I'm not a dealer.  You would probably do better trading it in.