Are you looking for a step at tub height? Most sliders have that built in or as an option. The Savvy ones are popular around here.
https://savvyoffroad.com/product/sav-rkrlj/
If you're looking for a step below the body line, there are independent steps you can get that mount to the frame. I believe they were even a factory option. They will impact ground clearance, and can easily be damaged by stumps or rocks though.