In what forms is sodium hypochlorite loaded onto vehicles?

Safety precautions for filling liquid chlorine cylinders in tank trucks: 1. Laboratory technicians must have a high sense of responsibility; cylinders that do not contain chlorine or those with a purity level of less than 80% should not be filled. 　　2. The filler must conduct a strict re-weighting; overfilling is strictly prohibited. The error between the two weighings must not exceed 1% of the filling volume, and a different person and a different weighing device must be used for the re-weighting. 　　3. Anodized copper tubes shall be used to connect the gas cylinders, and these copper tubes must pass a pressure test. The shift leader is responsible for pressure testing, replacement work, and recording. 　　4. A special opening wrench should be used to open gas cylinders; it must not be used for other purposes. 　　5. The bottle valve should be opened slowly, and it should not be closed forcefully either. 　　6. All operational processes must be properly documented. 　　7. The winch mechanism of lifting machinery must be equipped with a dual-braking system; it should be checked and verified before use, and electrical maintenance personnel should be contacted regularly for inspections to ensure its proper functioning. 　　8. Sufficient lighting must be available at the site during night loading and unloading.

Are there tank trucks for liquid chlorine? Not this kind of bottling

There are definitely tank trucks, as well as specialized transportation companies. I don’t know if it’s available where you are.