You would have to know the specifics. For instance, single axle box trucks often are equipped with conventional leaf springs, which do lower under load. However, the rig in the photo accompanying this story is most likely riding on air bags. They have control valves to maintain a preset height.
I wrote “highway...” to differentiate between local delivery trucks, and the kind used for long haul work, which is the kind that was involved in the accident.
Additionally, looking at the photo it is possible to see the cargo in the trailer...it wasn’t empty.
I wasn’t clear. My comment was not about the accident that gave rise to this article.
The trucks that damaged the bridges near here were highway-type 18-wheelers, but it’s obvious from the replies I’ve gotten that they must have been equipped with leaf springs.