The minimum standards are a set of regulations called FMVSS, administered and tested by NHTSA. I'm not aware of any parts of FMVSS that apply specifically to po

The minimum standards are a set of regulations called FMVSS, administered and tested by NHTSA. I'm not aware of any parts of FMVSS that apply specifically to power trunks, but the equivalent force standard for windows is 100N. FMVSS compliance is largely self-certified by manufacturers though. NHTSA does release test reports of what compliance testing they do, but it's pretty limited.