This is a cotton truck. It has a conveyor belt in the bed of its trailer, making it look like it's picking up giant marshmallows of cotton in a way that defies physics. For some reason, I just can't stop watching.
Maybe it's the jovial jiggling of the round cotton modules. Maybe it's the fact that I just really like big trucks. The video shows what's actually a very routine technique for loading and unloading cotton trucks, though one typically uses rectangular modules.
Either way, I have the strangest boner right now.
(Hat tip to Demon-Xanth!)