Yeah, the SS cart has rust on the lower tray and the locking mechanism part fell off. One the first year, the other this summer. Never seen that with anything else I've owned. I am about 15 miles from the ocean but I am surprised that they used such inferior parts. I called them the first year and they told me that they will send me the replacement wheel, all I need is pay the shipping. I did not do it because I can't even imagine taking that thing apart.
As for the grate, I might give the cast iron a try. I was hoping that there is a stainless steel option but I don't think they have on. I wonder if the lifting tool is able to work with cast iron grate. BTW, the lifting tool is also rusting.