[Lenny5160]

I also noticed the ring welded to the frame for tying that car down, and I'd think that would put a lot of load onto the spring while towing and could have contributed to the breakage.

I run the Calvert split-monos and tie my car down around the rear end housing. I've never had a spring problem, but they did settle enough after about 15 years that I had to replace the rear halves to get some ride height back.