I bought a separate crate and trolley as opposed to the all in one type because I want to be able to use the crate at benched shows and couldn't work out how you would get the whole things, wheels and all, on a bench. Anyway I am now at a loss as to the best way to attach said crate to the trolley and make sure it is safe. I have tried bungee cords but it still wobbles about a bit and makes Mylo nervous. I also tend to lose them in all the paraphenalia. Any ideas on the most secure, most convenient, way to attach a crate to a trolley that is still simple to separate.