If you are building MEWPs, ISO 18893 must guide your R&D. The pdf includes mandatory stability tests (tilt table tests) and structural calculations that must be validated by a third-party engineer.
The test requires a complete shoe. The shoe is typically mounted on a last (a solid form in the shape of a foot) or a rigid internal support. This ensures that the shoe maintains its shape during the testing process. The upper is clamped to the stationary part of the testing machine, while the sole is gripped by a moving fixture. iso 18893 pdf