
I bought this one from Doghealth:
http://www.doghealth.co.uk/products/dog-show-silver-cage-trolleyI figured it was cheap enough so that if it turned out to be a total failure it wouldn't be too desperate. It's not a bad trolley, as it turns out. It's easy to assemble if you need to take it apart to fit in the car, and it's half the weight of some of its competitors, which was a major onsideration for me.You could spend more than double the price and get something that isn't significantly better.
I have 2 medium sized gundogs and with them in a crate plus paraphernalia it was pretty heavy and slow to pull along. I can't be sure whether it was the standing all day at Crufts, or the pulling the trolley, but my back was in a bad way by the time I got home. The trouble with pulling something behind you is that you are half twisting your spine, and if you are lugging 85kg+ behind you your back will complain!