WARNING: this reply relies heavily on my memory and therefore carries considerable risk :)
If you intend to use it a bit before redoing the springs then it is worth noting some advice contained within a thread ages ago but I cannot find the thread. Probably before the move to the new site. From memory it was from someone up north who has a lot of experience salvaging trailers that had broken on corrugated roads. He strongly recommended that the plate that joins the U Bracket (?) at the end of the leaf to the chassis be at least 150mm x 75mm x 4mm otherwise they tend to break from the vibrations.
Perhaps someone who knows what they are talking about, or who remembers that thread, can be a bit clearer.
I do not know if or how that relates to RonMcGr suggestion about the leaf springs with shackles.
