I think I understand your frustration. We, too, traveled about 10 hours one way on a long weekend to pick up what we thought was a very good trailer with minor problems. When we got there, the vents were broken out, which allowed rain to soften the flooring, the couch which in pictures looked fine with the throw over it had apparently been lunch for many rodents, the pull out bunks were split down the middle, and the systems had not been checked as they had said they were. We ended up just driving home, another 10 hours, very dissappointed and frustrated. The very next week, however, we found a trailer about 30 miles away that is in what I would consider perfect original interior condition. The only problem is the clear coat is separating, which is fine since we are wanting to polish it to a mirror finish anyway.
All that to say this. Don't be discouraged. There is a perfect trailer out there for you and your family.