I'm holding on to my beloved 2-step folding steps as long as I can, because it seems like they're no longer available.
(just a pic I found on the web to link to).
It's borne my not-light-weight for several years and fits my needs.
The current version is smaller without the intermediate step:
A step that's connected to the truck -- hitch-mounted -- or the camper would be OK, too, and might be better than my current step because it doesn't depend on the ground.
But it would only be OK --for me -- if it didn't hang down
at all while driving. I don't want to have to think about, worry about, dragging something when driving over rocky/bumpy ground.