I made a mistake by getting rid of my child trailer and buying the Burley Flatbed last year. I was able to carry so much more, and with ease using a trailer with four walls and a convertable top. THe Nomad this year looks much nicer than what I saw last year, so I might have waited and gotten that, had I known it would be improved.
Two Ortleib panniers can hold almost anything, so I use these most of the time. When I put >50 lbs in them though, I wish I was using a trailer. I know that I've pulled a lot of weight and never had a problem with either of the Burleys that I've had. I agree that the hitch is very easy to use.
When I save up enough, I might get a Bikes at Work. Ive only heard many good reports from people who use them. Their trailers are built to pull almost any size load.