My BOB trailer on BC's Kettle Valley Rail Trail / TransCanada trail last summer, just north of Coquihalla Canyon.
Instead of using the BOB drybag, I found a 90 litre drybag that fit the trailer perfectly. Even though I didn't pack it that full, it is a real luxury to pack because there is so much easily accessible space. The only other mod was to zip-tie on some water bottles (which was very handy) and to replace the crappy stock tire with a Schwalbe tire that rolls better and has some puncture resistance.
This ended up being a really rough trail for a cx bike and trailer, although the combo works great and dirt roads and fire-road trails, particularly if I want to carry a lot of gear, like on fly fishing trips in the backcountry.