It's basically flat (< 3% grade, downhill from Cumberland to DC). The DC portion is more groomed than parts west where it can be rutted, rooty and bumpy, but it is by no means an MTB trail. I usually run cyclocross tires 32 - 35mm wide.wiretapstudios said:I've read about this trail a lot, and done some of the other trails in the DC area...is this a fairly flat ride, or is it up and down mountains? I think that would make a diff in the trailer vs. carry all decision. Also, if I did this, a trailer would be wayy too much. If you can't carry it somehow, find a way to leave it at home.