Longacre Racing scales. Can be used with 3 or 4 pads. I have weighed amphibious and straight float equipped aircraft with these. Just use 3 pads for standard landing gear. 3000 lbs per pad capacity. Each pad is 15 inch square. Will need to be certified. Very good condition. Still in original boxes. you can weigh an Otter or caravan on amphibs. 3500$ new.