Would appreciate any help on this subject please. We have bought two montain bikes and with two children 3&almost2 was wondering what would be the best, a child seat that attaches to the bike or a child trailer. Has anyone got any experience of either of these? Are they difficult to balance with, heavy, which is the most convinient for travelling about with and which is the safest? My dd has SN so I am not expecting her to be riding a bike for some time yet. Very grateful for anyones input. Thanks