My little boy is now 14 months old.
To be honest, at 6 months it was pretty hard work getting everything he needed in a car. On top of that, he was also a terrbile sleeper and as such, was very demanding at different times of the day. At times, simply getting through a day was challenging enough. That may sound a bit melodramatic but anyone that hasn't slept for the first 12 months of their babies life will know where I'm coming from!!
As for putting a baby that small in a trailer, I just wouldn't want to do it. I've had enough near misses myself, on my bike, that haven't been of my making and I just wouldn't him being exposed to that kind of risk.
Each to their own but I think I'd put it off for a year or two.
Either that, or get the grandparents in!!!!!!