Finally had a chance to upload a photo of our new Chariot trailer for the boys. This is a Chariot Cougar 2. Chariot Carriers are based in Canada, and are arguably the best child trailer makers in the world. From Japan, they can be bought from REI, and sent via Fedex. The shipping is fairly expensive however, so a very kind friend very kindly brought one back from the US for us.
The kids absolutely love it (and our friend for bringing it...). It is slightly wider and heavier than our old Burley Solo. When we unfolded it in our living room, our first reaction was "no way -it is too big". But it is surprisingly easy to manouver, as you can see in the photo of mum here, and the trailer really is only barely wider than the handlebars, so you really don't need any more clearance than you would otherwise anyhow. Her battery powered assist bike helps her on the uphills of course, but otherwise she switches it off and goes fully "human powered". I can pull both kids up the hills on a regular bike no problem, so we also bought an extra hitch so that I can attach it to my regular town bike.
Some of the great features of this trailer:
> a solid hitch that is strong and safe, but very easy to detatch trailer from bike
> fantastic suspension - incredibly, the battery on the assist bike lasts longer, probably because of the suspension. It also makes pulling easier, and of course bumps are less jolting for the boys.
> plenty of storage space in the back
> great air ventilation for summer, but proper rain cover for wet weather - keeps the boys completely dry in a downpour, but the cabin does not steam up like other models can when the cover is down
> fantastic fold, that enable it to be folded down flat, quickly and easily - you could take this sucker on the train (as long as you had someone else to look after the kids while you lug it).