2 : truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity
3 : truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity
4 : truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity
