There are many kinds if you do a google on hitch steps. They have some 36", 42", or 12"-18" wide. They have some adjustable up and down, in and out---some with lighted custom lenses. They even have one at Go Rhino that has built in backing sensors.
I am getting one. I haven't made up my mind which, but I bet it keeps most folks off my tail.
I have found lengths of hitch step bars from 12" to 40".
Before I fell in love with one I decided to measure between the exhaust tips, can't have anything covering those, uhh-uh.
36" between the tips.
I will get the 36 incher-prob stainless. I have seen one way cheap on ebay, they float around $100-$140.