The model I purchased was rated for up to a 90lb pig but it couldn't turn a 40lb hog. I realized that the skewer wasn't lined up perfectly with the backbone and the pig was set too far away from the skewer, so that it's effective weight was over 90lbs. If you are doing a full pig, make sure it's centered and the backbone is tight against the skewer.The grills underneath were two 17" grills from Walmart. They were the perfect height and width.