Welcome to the forum. It took a long time for the "new trailer" smell to dissipate from our trailer. It lessened with time. At first it was so strong that when we first went in after it had been closed up awhile, we couldn't breathe. We would have to open it up and let it air out for a few hours before we could go in for any amount of time. It was probably about 2 years before we didn't notice "the smell" when first entering the trailer after it had been closed for awhile, so it was obviously still "venting off", although it didn't bother us after we opened a few windows. I don't know how it would be for someone allergic to it.
Glenn & Beth (Dad & Mom)
David & Audra (12 year old twins)
2006 Dodge Power Wagon (Adventure & Tow Vehicle)
2006 Rockwood 8281SS (Home away from Home)