I haven't pulled with Carbon but I've been discussing it and I'm going to do it - it's just a matter of time. There was a thread about carbon on a trainer and folks were saying carbon is less susceptible to repetitive stress fracture, which sounds a lot like pulling a trailer to me. I also have a skewer mount - although I"m not sure how much stress is really on the frame vs the skewer - I have to take a closer look at that.
I usually pull with my 26inch hybrid. Although speed doesn't seem so much like an issue - once the trailer starts rolling it like to stay rolling - and I can easily sustain 16 or 17 on the flats. The real issue is my cheap schwinn trailer acts like a big canvas sail. Going into the wind on the back bay I can only hit about 13mph. Of course, going back with the wind in the sails I can easily hit 20
