- You cannot add "(REFURBISHED) VEVOR Rubber Threshold Ramp, 4" Rise Threshold Ramp Doorway, Recycled Rubber Power Threshold Ramp Rated 2200 Lbs Load Capacity, Non-Slip Surface Rubber Solid Threshold Ramp for Wheelchair and Scooter (700721029129,700721033423)" to the cart because the product is out of stock.