I have this one right here and it works great. Took under 5 minutes to setup so switching back and forth shouldn't be too hard to do. I did use some electrical tape to pin the arms together to eliminate all of the rattling sounds and now I don't hear a thing. Also although I've linked to the Petland website don't buy from them...it's $100 in their store compared to $52 from Pet Planet for the identical product, not even on sale they just sell it for that much cheaper.
http://www.petland.ca/dog/dog-travel...fety-1567.html