Krista,
If you want to find out what the Trailmanor is worth go into
www.nadaguides.com . You have to select travel trailers, and the follow the instructions. I went into the website, and what I told you about the model numbers as 28, 28F,28SD, and 28Sl were used in the models in the nada guide. The 3225 might be a very late 1993 when they started to change numbers or it is a true 1994 model. To answer the mystery, you would have to look on the road side of the trailer for the plate that shows the VIN # and date of manufacture. RV's start to change models years in May or June depending on how many supplies are left over from the present model year.
You also have to know what accessories are on the unit to get a good price.
Let me know how you make out with the website from NADA. Hope this info will help you out.
Bob Strong