The brackets don't really support much weight so are light gauge sheet metal bent to shape. Wouldn't take much work to heat them with a propane torch and pound them straight enough to reuse. I carry a small bench vise with a hammering platform just in case I need to do something like that.
I have the lower portion of my '02 Journey off right now while working on the heat pump and all of the brackets on my RV are removable. Your Journey's back end looks just like mine.
If they are all twisted up and beyond re-usable condition, salvage yards would be happy to sell them to you.