PS. There is a big difference between wingborne G loads (+6/-3) and a landing impact.
The former involves primarily udls (uniformly distributed loads), airframe pressures often largely mitigated by inertia.(alleviation)
The latter more like point loads exacerbated by inertial considerations.
The whole story cannot be told by a single 'g' figure, as John Farley said quite way back. But a central body 'peak G' does give a comparison figure, and thus a measure of likely structural damage..