Due to our desire to offer an open ecosystem, most trailers and caddies will fit on the Ahooga. Most of the time, these are fixed on the rear axle of the bike which is 12mm on the Ahooga. If the trailer your are choosing has a 12mm axle adapter, that's fine. If not, you will simply have to widen the hole in the adapter. Hower, we advise you to inquire with a bicycle dealer.