Configurable ladders are used to create crossover platforms, max-access platforms, multiplatform access systems, and rooftop platforms. U-design crossover platforms provide a means for users to move over obstacles or hazardous areas instead of having to go around or through them. U-design rooftop platforms are used to create safe access over pipes and other rooftop obstacles. They have special support feet that distribute weight and prevent roof damage. U-design max-access or multiplatform access systems suit applications where work is being done at height. The platform components are used together for more width and length, allowing users to create custom multi-tiered systems.