I personally would not spend that kind of money on a stick-built trailer, unless it was an Airstream or Argosy. Especially not new, as suggested, because of the depreciation, which is steeper than for automobiles. You should be able to get a used one functionally equivalent and just about as durable - which is not very - for about 1/3rd the price of new. The key is to make sure it has been sitting most of the time, no leaks, and hasn't been hauled alot, especially not on bumpy roads, because stick-built trailers rattle apart over time, and are prone to leaking... don't even get me started on slide-outs.
If you are going to invest tens of thousands, I say buy quality and durability. My Bigfoot fiberglass trailer is 25 years old, still rock solid, and I have taken it on many roads that made me wonder whether I had lost my mind. The only structural renovations it really needed were resealing windows and upgrading of the axle and wheels to modern size/style. The rest was mostly personalization and adaptation for full-timing. I got it for $6.5k and put about 9 more into it, plus lots of labor, but mostly because I wanted a real twin bed, real couch, and off-grid capabilities.
http://www.flickr.com/photos/pindraak/sets/72157629969723784/
Fiberglass has far fewer seams to leak and doesn't weaken or loosen over time, because instead of being a box made from nailed or screwed together wood, it is essentially two boat hulls seamed together like a clam. Eggs are inherently light weight, at least compared to the only comparable quality stick-built trailers: Airstream and Argosy. Rarely will you see a stick-built trailer on the road that is 20+ yrs old, but you see eggs and Airstreams all the time.
You could probably get a used 21 or 25 foot Bigfoot egg for 1/2 to 2/3rds what the trailer you mentioned goes for new. You might want to try poking around these sites to investigate:
http://www.fiberglassrv.com/
http://www.fiberglass-rv-4sale.com/