Abstract: A tray system comprises a tray comprising a bottom portion and sides forming a volume in which junctures of the sides and the bottom portion are rounded to comprise convex exterior surfaces. The tray further comprises two loop members disposed on opposing ends of the tray. A connecting member is configured to removably join to a one of the loop members. A lead device is configured to removably join to the connecting member. The lead device is operable for transferring a motive force to the tray to transport the tray over an uneven terrain comprising obstacles in which the convex surfaces enable the tray to maneuver around or traverse the obstacles.