By clicking on the + New option from the header, you will be redirected to the “New Asset” page where you can add a new truck with the required details.
You need to insert the required details for your truck asset. You need to insert the Hazardous Material that the truck would carry out during the transportation. You will see the drop-down list of different materials and you can choose the multiple options from that drop-down as per requirement. 
After inserting all the details related to the truck (Asset), click on the Save or Save & Close option to add the asset. You can select the Truck as per your defined “Routes” to transport the products or other stuff.