The tray has a horizontal base and an edge. A C-clamp has a horizontally oriented side coupled to a bottom surface of the base, normal to and adjacent the edge. The C-clamp has first and second vertically oriented sides extending downward. The second vertically oriented side has a threaded hole. A screw has a shaft, a handle at a first end, and a shoe at a second end of the shaft. The second end of the screw passes through the threaded hole of the second vertically oriented side of the C-clamp and extends horizontally toward the first vertically oriented side of the C-clamp. Moving the handle causes the second end of the screw to further extend horizontally toward the first vertically oriented side of the C-clamp such that the shoe and the first vertically oriented side of the C-clamp frictionally engage the support structure when positioned therebetween.

A bed guardrail with a folding table board, the bed guardrail comprises: a guardrail and a table board with rotating features; the guardrail includes an outer frame; the rotating feature facilitates the table board to rotate around at least one rotary axis, wherein, the direction of at least one the rotary axis is the same as the extension direction of the outer frame; the table board has a relatively flat table board surface, when the table board rotates around the rotary axis, the table board has a first position and a second position; when the table board is in the first position, the table board surface remains basically parallel to the ground, when the table board is in the second position, the support direction of the table board surface faces away from the bed body.

A tray assembly for use with a bed includes a planar support configured to extend under a mattress of the bed, an upright post connected to the planar support, an arm connected to the upright post, and a worksurface platform mounted to an end of the arm opposite the upright post, wherein the arm provides an adjustable spacing between the upright post and the worksurface platform.

Provided is a sliding and folding bed table with adjustable height, designed for use over beds in confined living spaces such as campers, camping trailers, RVs, rooftop tents, and similar environments. This table is particularly useful in areas where room around the bed is limited or where the bed is positioned close to the floor.

A platform assembly with platform extending in a horizontal plane with a bottom surface, a vertical support member coupled to the platform and a C-clamp. The C-clamp comprises a horizontally oriented side coupled to the vertical support member; a first and second vertically oriented side extending downward; the second vertically oriented side comprising a threaded hole. A screw comprises a handle at a first end of the screw, and a shoe at a second end of the screw. A second end of the screw passes through the threaded hole and extends horizontally toward the first vertically oriented side of the C-clamp. Movement of the handle causes the second end of the screw to further extend horizontally toward the first vertically oriented side of the C-clamp such that the shoe and the first vertically oriented side of the C-clamp engage a support structure.