Steel shop and stock trucks, mostly 18 x 30 in. through 24 x 36 in. deck sizes. Deck style is what you are choosing: open shelf trucks for boxed goods, lipped stock trucks so parts do not slide off, four-sided box trucks in solid or mesh for loose material, tray and deep tray trucks for small parts, and bin carts for pick operations. All-welded frames cost more than knock-down but survive forklift traffic, and cushion-load decks isolate the load from the floor when what you are moving is fragile.