Tailgate
The tailgate should be hinged at the top and have the capability
of being latched closed at the bottom as shown in Figure 7‑39. This
prevents the aggregate from spilling out until the tailgate is unlatched.
As the bed is raised, the locking mechanism on the tailgate should
be checked. It should lock securely when the bed is in the down
position and unlock smoothly as the bed begins to rise.