I was tired of not having a level camp stove when using a picnic table.  Fabricate a leveler.  Here is a simple, relatively inexpensive solution.  It uses common materials.   If you have a welder and a hack saw this is a couple hour project.

The idea for this leveler has been rattling around for some time.  You may have to alter this to accommodate your stove.

(4) Sections of 1 inch x 1/8 angle iron
(4) 3/8 Coupling Nuts
(4) 3/8 x 2 1/2 Elevator Bolts.

While I buy my steel at a steel supplier, it is available at Home Depot or Loews. Just be prepared to pay double at the big box stores.

4 pieces of appropriate length 1 inch by 1/8 angle is used. The ends are cut at 45° angles and the length is made 1/4 inch longer on the inside measurement, than the outside dimensions of your stove. That gives a little bit of play (1/8 inch all around) in case something is slightly off.  Be sure to square up each corner before welding.  Also gap all weld joints to create your exact dimensional length measurement, before welding.  Depending on your stove you may have to add a middle support(s) using 1 x 1/8 strap.

My 4 pieces that create a rectangular leveler frame, are clamped to a welding table upside down. The bottom of the 45° seam is welded. The vertical corner seam is welded. (DO NOT WELD THE INSIDE OF THESE SEAMS)

When all four corners of the leveler are complete.  Grind your welds to your finished preference. Clamp the rectangular frame down to your welding table, top side up.

Weld your “coupling nuts” to the sides flush with the front edge. End of nut should be flush with the table top (and the finished bottom of the frame) Grind welds if needed.

Finish paint with high temp flat black.