Nothing i hit in the 30 acres i mowed was much bigger than a softball. Most where in Gopher mounds hidden in tall grass. Same stuff i have hit for YEARS with the Landpride and it was hardly phased......................
I can see your frustration in this. I had the same mower like I said before, and I tore the heck out of it really fast. I ended up with a medium duty mower, and I can now mow over rocks with nothing more than a loud racquet and lotsa vibration to show for it. I've shattered many small soft rocks and have put this mower to the test. Within reason, it will stand up to hard abuse for years. I try to avoid rocks but many times they are hidden, I don't mow fields, or grass, or anything resembling easy mowing very often.
That said, I CAN damage my mower, I can bend it, I have bent it, but it takes a lot.
It's strange that your seeing so much more damage in the Woods unit than in the LP unit, although thicker steel will certainly account for some of it, even though it's not "that much" thicker.
Are you mowing at the same PTO speeds you normally do? Do you have a "extra productive" stone crop this year compared to the years past? I winder if the Woods uses a "softer" steel? I wouldn't think so, but it's interesting to see the difference.
If your mowing anything but field grass and saplings under a half inch, I would strongly suggest you get a heavier cutter. Is the Woods 720 really 1,400lbs? Are you sure that's not the 7200?
You can't handle the weight of the 7200, then perhaps drop down a size to the 600. It wouldn't take that much longer to mow as you could mow faster, and if your worried about size, you can maneuver through tight spots easier.
Or, stick to your plan about strengthening the unit itself. It won't work any different with dings and dents in it, it will just look uglier. Even strengthening the side skirts though will not make it last any longer, you'll still beat it up much sooner than a heavier mower.
It's too bad this didn't work for you, there is no good outcome when a product can't meet the buyers expectations, right or wrong.