I know of no GPS that will hold the long description from the cache page/.gpx file. I've heard of folks putting the hint into the "notes", or some basic meaningful info, but there isn't enough room for the full long description from most cache pages. The actual character limit for the "Note" field may vary by model.
Thanks for the reply, I guess I was looking for something that doesn't exist. I was thrown off by the author of this thread when he mentioned the perfect "paperless search". I assumed that meant all the info could be seen on the GPS out in the field.