Modern highway trucks, huh? Well then, a couple of trucks that slammed into local bridges around here in th past few years must not have been ‘modern highway trucks’, because that is precisely what happened in both cases.
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.
Not all trucks use air-ride suspensions.