We have a drywall cart that has a UMHW?base on it, holds 10-15 sheets depending on thickness. It has really nice 5" casters on it, all 4 swivel but 2 have the option to lock straight although we never do. It rolls perfectly across our asphalt driveway, even when covered in walnut tree debris. If sheets are going to be used in short order they just stay on the cart. If storage is needed for a bit longer, I can just unload it straight into the vertical rack. I just slide the sheet off one end, tilt it up on a corner and slide it standing up into the rack. When it's time to use it, slide it out of the rack and tilt it down right onto the saw. The only time I ever lift a sheet is when it's coming off the delivery truck and two of us do that so it's easy.
We also have the Hafele Adapta Cart (tilting one) It's okay, but not nearly as nice for moving stuff around as the other. It's big and clumsy in comparison and the wheels aren't as smooth.
Jason Holtz J. Holtz Furniture
3307 Snelling Ave. South
Minneapolis, MN 55406 612 432-2765
-- Jason J. Holtz Furniture 3307 Snelling Ave. South Minneapolis, MN 55406