While buying new comes with a warranty, it is usually just a one year, two at most. Warranty work takes time, often weeks, before dealer even gets warranty approval. Where would you live, when trailer is at dealer for repair?
I'd suggest a 2-4 year old trailer that has been well kept, and all the fix up/warranty issues done. Most new trailers do have issues. Often times it is better to handle these yourself anyway, even if under warranty. You can buy a lot of trailer, after several years of depreciation, and not lose as much, when changing your mind, moving in a different direction.
Jerry