Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Do those have a little "fence" running around the edges?When I used metal carts, I flipped the top shelf making it into more of a "table" than a box with sides which seemed to get in the way.
These we found to be the best deal and work awesome. We put the top part in upside down when you build it so that you have a nice flat smooth surface, cheap, strong, and easy. http://www.harborfreight.com/24-inch-x-36-inch-steel-service-cart-5770.html
Jon we use rolling cabinets for our shirt carts. In fact our shirt cart fleet is a rather odd bunch.