VEVOR Ladder Levler, 23.4 L x 11.4-18 in H Support Surface, Steel Ladder Leveling Tool, Folding Pitch Hopper, Stair Ladder Stabilizer Easy to Use,Extension Ladder Accessories for Uneven Ground

Can you tell me the weight that this leveller will support ie, ladder weight with a person on the ladder. So essentially will it support 20 stone, 30 or how many. Happy for your response to be in stones, pounds and ounces or Kg.