Abstract: A tray system that includes a collapsible tray assembly pivotally mounted to an articulated positioning assembly wherein the articulated positioning assembly includes a frame attachment clamp, a left/right positioning adjustment mechanism, a forward/rearward position adjustment mechanism having a tray support arm pivotally mounted to the collapsible tray assembly, a tray angle adjustment mechanism, and a support arm angle adjustment mechanism; and wherein the collapsible tray assembly includes a two-part tray mechanism including a left tray member, a right tray member, and a sealing gasket, the left and right tray members being secured together by a pair of hinges and lockable with a locking mechanism in an unfolded configuration, the sealing gasket being compressed between left and right edge portions of the left and right tray members when the left and right tray members are locked in an unfolded configuration, each left and right tray member including a recessed portion partially defined by a perimeter flu