I have a 2011 DB sortie 1 that I bought used and it is a lot of bike for the money. I ride it pretty hard and it handles everything I can throw at it. The rear frame does have some flex in it though. Mine just has the regular quick release rear wheel and they went to the through axle in 2012 to help strengthen things. Probably fine for light riding with the panniers mounted on it but I doubt you will find too many people that know for sure. How much weight are we talking about? Trailer?