Room dividers, folding accordion style. These are similar to what might be used in a restaurant or conference hall to separate large rooms into smaller ones.
These appear to have rollers that probably mounted in a track on the ceiling, but i do not have the tracks for these. You might be able to find a compatible track elsewhere.
Each dividers is about 8.5 feet tall, and probably about 20 feet wide when fully extended. I have two of these. Each is very heavy (several hundred pounds), with metal framework and a fabric covering. (I do have a gantry crane that might be able to help lift these onto your truck or trailer.)