Did the mechanic give any reason as to why they were so against pulling the trailer with the TAB?
I pull that setup a couple times a month, anywhere from 5-50 miles. You'll have to decide what you think is safe. I am pretty much of the opinion that the trailer is almost as safe as being alone in traffic. Maneuvering, control and hills are a different issue, which is more about your environment and your skills. The road vs mtb setup is not to much of an issue. A road bike will do fine although you may not have as low a gear as you might want and the brakes may not provide as much stopping power as an mtb. Nothing serious, you just have to take that into account when you are pulling it.
Last edited by masiman; 06-22-09 at 08:19 PM.