I use a 72"x30" folding table. At first I used the bed risers, but the table was still too short for me. So my DH used pvc pipe to raise it even more for me. He measured the correct height by my standing next to the table and my showing him how high I wanted it to be so I don't have to bend at all. He put caps on the bottom of the extensions so they won't cut into the carpet. The caps also made them more stable. :) Good luck in figuring out what is right for you.