I don't know. One that I saw has wrinkled the top metal about 6-8" from the back edge. Another had bent the hinges. To do much to the ones I saw, you'd have to slice the top off and get into the overhead structure, then design something that not only stiffened it up, but also fit when the top was put back. The fix most wing-guys go for is to only use the stock-strength struts (or none at all!) and carry a prop-rod to supplement them. On occasion, the attach points on the wheelwells will tear off, even with stockers, and those are easy to re-weld better than new once you move all flammables away from the area.