This is apparently a very common problem with new(er) trailers. My neighbors bought a trailer that was a couple of years old, and the wife couldn't stand being in it for very long. They ended up selling it. Some people are really sensitive to the smell/fumes. They aired it out for days/weeks on end, and it didn't help. Have you heard about all the discussion on the FEMA trailers having this same problem?
http://newstandardnews.net/content/index.cfm/items/3531