The truck was traveling on a Gold Coast motorway towards Burleigh Heads when they were filmed by another motorist.
A tower of boxes and crates topped with a bucket and a big blue can was tied to the back of the truck.
The vehicle appeared to be able to tip over at any moment.
The truck continued to travel down the highway, its load remaining intact.
Police have advised drivers to be wary of anything they attach to the back of their vehicles.