I think the jack was used on Starcraft Pop Up trailers.
As I remenber they did not list the jack on their web page.
I sent them a e-mail asking if they had it.
It goes in for a new axle
I found a shop who will modify the frame to accept a stock axle
I replaced the old blue dried up stripeing with a new red reflective stripe.
After a good scrub with Boraxo and a coat of Zepp Wet Floor Finish it looks almost new.