Dock strike that folded a rear sill and traveled into the crossmembers
26 foot box truck, commercial fleet based near City of Industry
Short answer. The driver backed into a dock plate at speed. The rear sill folded upward, both rear door hinges were distorted, and the lift gate would no longer sit flush against the sill. The fleet manager assumed it was a door and gate issue. Measurement showed the impact had traveled forward and pushed two crossmembers out of plane, which is why the doors would not close square no matter how the hinges were adjusted.
What the job involved
- Measured the chassis and body frame against specification and documented every out of tolerance point
- Confirmed two crossmembers displaced and the rear sill deformed across its full width
- Straightened the frame section on the rack and replaced the rear sill assembly outright
- Rebuilt the rear door frame, replaced hinges and reset door alignment against the corrected sill
- Reinforced and reset the lift gate mounting so the platform seats flush and loads square
- Repaired and refinished the affected rear body panels and reapplied fleet graphics and reflective marking
- Rechecked all measurements after repair and documented the corrected geometry for the fleet file
How it went back out
The unit went back with doors that close square and a lift gate that seats correctly under load, which was the operational problem the fleet actually cared about. Repairing only the visible sill and hinges, as originally assumed, would have left the crossmember displacement in place and the doors would have kept binding. Body, structural and equipment work only. No engine, drivetrain or DOT inspection work was performed on this vehicle.
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