We want to get something to attach to one of our bikes for ds (3.8) he has low tone, and a tendency to slump. I have seen these [[http://www.amazon.co.uk/Weehoo-Igo-Bike-Trailer-2012/dp/B007T95EQ0/ref=sr_1_1?ie=UTF8&qid=1394311590&sr=8-1&keywords=weehoo weehoo]] trailers, which look great - has anyone tried one, or know of something similar which would be worth looking at?