I have both a Bob single wheel trailer and a Quik-Pak 2 wheel trailer. I prefer the 2 wheel Quik-Pak trailer for road touring. The nice thing about the 2 wheel trailer is that its easy to load/unload, no problem when you stop about getting the Bob in position to stand, lots of room, and it tracks very well. Also the Bob just kind of wags the rear of my bike, shifting from side-to-side especially the slower I go. The Bob really was first used off-road for mtn bikes and single track trails. No room on those trails for wider 2 wheel trailers. The Bob has now been adopted by road bike users and it works well, I just feel there are better choices for trailers used primarily on roads.