The hanger bracket that comes with any of the scissors stairs makes a pretty flimsy connection to the camper. You want the pivot of the stair connected rigidly to the camper or truck. I've done it both ways and either works. On the last truck, I attached them to a hitch extension. On this camper and truck, I attached them to the camper bumper, since it had one. However you do it, this will make these steps (or any steps) much more stable feeling.
I personally find that if the steps are difficult to use (such as needing to drag them from the camper and set them up) you will dread using the camper. Too much work to get into it. With mine it is 2 seconds.
I wrote this up awhile ago but photobucket destroyed the effort. Here is part of it again.
Here are all the pictures.
