Thai people have the craziest idea transporting over-sized items in small trucks.
The mentality seems to be ignore the weight limit of the truck, (often only quarter ton) and stack as many things in the truck as seemingly impossible.
The trucks are often stacked way above a safe height and load capacity.
If you come by one of these over loaded trucks on the roadway, it is best to speed up and pass to get in front.
The lack of safety and other conditions, you never know when the load will come toppling off the truck and into the road.
Not a safe practice, if you are a driving, do go around.