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The finnish language is something to behold.
I'm not sure about the first part~ it would be more accurate if it was "tyhjennä lasti". pura or purkaa is more like the word deconstruct or dismantle, I would translate this as:
"Drivers! Remember to unload your cargo and finish your day on friday." or "Drivers! Remember to unload and end your days on friday." if you want to make it sound more funny
still sounds like they want you to die though.