600 x 400 plastic dollies ¿ Perfect for handling plastic stack nest trays as well as Maxinest bale arm baskets and 180o stack/nest containers, the rotoXD90 is an ideal 600 x 400 plastic dolly for storage and distribution applications. A popular choice within the food industry as well as for supermarkets, grocery stores, farming, warehousing and general industry, these plastic dollies prove to be incredibly strong and durable.