Jacks typically slide in the bracket. Yours may be welded on. There is probably room to attach the bracket lower. If not, then you could use a piece of angle that is long enough to go from the bottom of the frame to the top.
I don't think it would be that big of problem if it isn't quite as strong. I know my heavy camper can be supported temporarily by 3 jacks. This happens when I'm lowering because there always seems to be back jack that lowers faster than the other.
However, I think I'd expect the tow company to cover it.