Hi
One year ago, a transporter came to the mine to pick-up a heavy mining equipment. The tractor came with a flat deck (53ft) but it had an unusual feature (at least for a non expert like me). The driver was able to raise by about 10" the height of the deck to match the height of the loading deck.
This to avoid equipment to do a big step while embarking on the deck. The deck remained horizontal at all time.
I did not asked the driver the make and model and generic name of such trailer.
I just want the generic name of such trailer. One guy told me that it used often to move office trailer camps from job site to job site but was not aware of a generic name. Can be actuated pneumatically or hydraulically.