Is there a folding table or bench that will work for me?

How about the seat of a Director's chair. Sounds about the right height, and they are lightweight, epically the aluminum frame ones.. Use the chair seat like an ottoman.. They also make some camp stools that might work, Same concept as the director's chair, Only no back or arms.. Canvas seat.. THis might NOT work less it has means (Addable I might add) to lock the legs spread since these tend to be "X" leg style.