Thanks for posting, this does look to be a good deal. These are really solid devices (I've got one of their high end units at home), but not sure its going to work too well in a TT environment (unless your full timing). The storage environment, and movement of the trailer is likely to upset the electronics in these. Technically...they don't even like to be in enclosed spaces without a fan running in the background. Also, its only going to do audio streaming, not TV. Plus, with as much as folks are looking at the weight of their trailers, is this really where you want to throw 30-50 lbs of weight?
If someone is looking to add surround sound to their home, this is a pretty good starter for that.