For years I have been using a BOB trailer for my off road adventures, and just recently picked up a new BOB Ibex. But the issue now is my 04 Gary Fisher Cake is wearing out so I am starting to look for a replacement. I need a FS bike that can handle the pounding of off road touring with about 45lbs in a trailer attached to the rear frame. Most of the new bikes from Trek and GF are targetting racing and speed. I need a light weight but durable bike. Any suggestions?