This cart would likely not fit cookie sheets unless on the top shelf. While the 21.5 inch length would fir the height of the tray, the distance between each shelf is approximately 12-13 inches and will not fit a 14 inch cookie sheet.
You need to roll it slowly but it does certainly roll full loaded with cans. The casters are plastic.
This shelf is not intended to hold extremely heavy objects.
This product is freestanding and remains standing upright on its own.
4.5" X 52"H X 20"