Have a project coming up and have been doing some reading online.
Going to be using all thread to hang a large sign cabinet on a parapet wall. The back of the wall is exposed to the sun and faces east while the wall sign will face the boardwalk of the Pacific Ocean.
I can't get a definitive answer on SS grade to use which won't be overkill. 304 SS which seems more common, or a 316 high higher grade, which seems like a grade made for direct water exposure (splash). The rear wall will get that mild salt air and mist which will bake when the sun is out.
I had one person suggest Galvanized and seal the rear with sealant, but then there is the inside of the cab, and you can't stop moisture from forming.
Hell, most stainless steel grill that reside on the beach have to be replaced every couple of years....salt waters a bitch
As a long time sign installer, you could see their rigging setup was going to fail from the get-go, as many here have also mentioned. It's become more and more common for GCs to be awarded projects and try their hand at sign work. This game sure isn't like lifting air-conditioners.
Lucky. This could have been much, much worse.
Vantage is an excellent company to use. I have about 8-10 of their units out there and customers like them. You get a better much better margin with Vantage then with Watchfire and a much better warranty-currently (7) years parts AND LABOR. Their customer service is a good as anyone's and I have sold Watchfire, Daktronics, Adaptive, Optec, Think Sign, Olive, Ebsco/Stewart and a few more I can't think of right now. I can't say enough good about Vantage.