Don't know if this will be much help Larry, but thought I would respond.
I put a Gardner's Chambered system on my 69 Chevelle back in 2010. Mine isn't exactly a trailer queen as it does get about 200 miles a year put on it. Have had no issues whatsoever to date. I know their chambered system is not stainless, but it is hard to beat their correctness and quality (albeit they are expensive).
Good luck with whatever you decide.