very soon i am going to need to transport my 3 year old to pre-school.

I would like to get a trailer to take him as i don’t drive very often and the wife needs the car.

Any experience in these?

Also how do they fix on the bike? i am rigjt to worry about fixing it to a carbon frame?

3 yr old – would a seat on the bike not be better?

in the summer maybe but in the rain and wind no way

I use a tagalong for wkd riding – they attach to the seatpost – can’t see why you’d have a problem with carbon

I work in Edinburgh Bicycle and we sell one that will be fine on any frame as they clamp onto a modifier QR for the rear hub, so no clamping on the frame. They are very stable in use and I’d go for it, although I wouldn’t fancy pulling my kid on a road in it for obvious reasons:
http://www.edinburghbicycle.com/ebwPNLqrymode.a4p?f_ProductID=10856&f_FullProductVersion=1

Little nobeer is 4 and getting too big for her burley! sad days indeed. It won’t last you long at the age your little un is at.