Additionally, the GlowStep is available as a 3 step or a 4 step system. Once you buy that, you can also buy "add on steps" singularly. That means you can make a 3 step into a 4 step or you can make a 4 step into a 5, 6, 7, etc step system simply by installing additional "single step assemblies" to the bottom of your existing GlowStep staircase.
I know a number of truck camper folks that use the system with 5 and 6 steps to access their cab-over camper doorway.
The only "limitation" to how many steps you can add is the space into which you fold them. Most trailers can easily accept a 4 step assembly, but 5 or more is "pushing the space" to the limit.
https://www.etrailer.com/Accessories...t/TLA8101.html
There also is a "very sturdy handrail" system available that mounts to the steps and the existing "hand rail" that's on your trailer.
https://www.etrailer.com/Accessories...t/TLA7621.html
While certainly "not cheap" they do make a significant improvement in stability of the steps and ease of entry with the hand rail.