Four table legs each with 12 adjustment-holes allows leveling and height adjustment from 18" to 30".  Best for leveling Roll-a-Table® on rough surfaces, or sloping campsites.  Great for using Roll-a-Table® while you sit on the ground or for shorter tents.  May also be used to raise Roll-a-Table® to 31" tall.  However, heights over 28" make Roll-a-Table® more flexible (wobbly) and that may not be good for your exact application.  Always tighten the legs with both hands for maximum stiffness.