Not sure if your steps are manufactured by Lippert or Kwikee, but in either case, they will certainly withstand the weight of a person. Your reference to a bolt falling to the ground suggests a possible cause and I suspect if the bolt is replaced, problem solved. My opinion is that Kwikee makes a better step than Lippert, however I've had problems from Kwikee steps in the past as well.
Have your dealer address the steps. My guess is that it's an easy fix.
Mike & Suz
2014 Georgetown 351
Pontiac Vibe toad
Buck & Patsy, the boston-mix guard dogs