Your picture is not showing the door, but judging from storage door your set up is similar to mine.
The door is about 12" above the bumper, what makes danger step to start with. So you balance on narrow bumper to have next step 3 or 4".
Than next steps are every 8" (or close to it)
When we can deal with it, grabbing ladder for the support, it is big challenge for my small dogs.
So I wonder if I could rebolt the top side brackets and attach them to 1st step to be even with bumper.
Now seeing your close-up picture I think I can figure it out.
Thanks