now you mentioned it, it does look like a Chinese rip-off of the AMOS mortar system. Looks like a rough prototype design because I doubt the final product would be mounted on a truck like that
This is just a guess but I saw those pictures show up towards the end of the Olympics. There's been a lot of stories about China seeding clouds to control the weather for the games. Maybe these were the guns used to fire the shells to seed the clouds.
The caliber seems a bit wrong for cloud seeding. I think most cloud seeding artillery is under 100mm, while those look like 120mm mortars at a rough glance.
Because weather modifying artillery belong to PAP.
Considering that official report that more than one thousand rockets were fired to disperse clouds in Beijing then this should be just such a gun system.
Makes no sense to be anything else as the system lacks basic firing control apparatus. Where is the elevation control?