What would work is a simple flip over step. I looked thru your blog looking for pictures of your camper and you have bumper, also the required brackets. (scaling and cropping induced color & quality shift)
It looks as though your landing utilizes the mounts under bumper and would interfere with a flip over so additional brackets would be needed.
On yours as door swings to ladder probably need to mount on left side-
This is ours, I moved original flip over brackets a bit further to right side. Just pieces of channel riveted underneath or nut&bolt if can reach.