If it fits, it ships

An overloaded and/or poorly loaded vehicle, often U-Haul rental equipment. Obviously unsafe even to casual observers. High risk of the load becoming dislodged, causing a traffic accident and heavy damage to the vehicle and load.

Justified by the moron driving by saying "if it fits it ships". From an early 2000s US Postal Service advertising campaign.

I rented a U-Haul car carrier to tow the F-350 behind my Honda Civic. Yeah I know the truck bed is full of paving stones. No, not the other way around, the Civic is the tow vehicle.

If it fits, it ships.