Is there such a thing as a wheeled cat carrier? I have been trying to search around for a new carrier as the large one I have at present is too cumbersome and both cats sit at one end making it very heavy and difficult to carry. This previously has not been too much of an issue other than getting through the doors to the vets but now the vets have rearranged the access to their doors meaning I have quite a long walk with this unbalanced cat carrier which is very hard work and uncomfortable for me. I don't want to go down the line of separate carriers for a variety of reasons so need to find something that is more suitable. What I've got at present is a large wire front opening basket. I've looked and tried the square and found this more cumbersome than the front opening. I'd love one thats a little trolley I could pull along but having scoured the net I haven't come across anything like it.