Well, I haven't done any pricing on 2005 CCD trailers, but the price doesn't look to be exactly a give-away--what about this ad seems too good to be true?
I would agree that it looks like it is in very good shape with the exception of the 2 or three small dents I see around the trailer. You might be able to reduce the significance of those dents with some kind of "paintless dent removal" techniques, but the only way to make it look perfect again would be segment replacement, which runs in the vicinity of $2k each to have a professional do the job.
As far as the response you got from the seller, I would agree that it is odd that they posted the ad, and within two hours they have a potential buyer causing them to hold it for a week, but maybe there is someone else out there just like you who thinks it is a great deal, or maybe they had it advertised elsewhere as well. Anyway, the scammy response is usually something to do with the trailer being located in an entirely different state, but they will ship it to you free of charge, they just need all your banking information so that they can set up the "escrow" service, which will guarantee your satisfaction, blah, blah, blah.