I sell and deliver bulk materials like soil, mulch and gravel to homes. I use my own dump trucks for delivery. My delivery fee is $60 per trip. Some customers want more than one material delivered, this means they will have 2 deliveries to their home (2 $60 trips). I cannot figure out how to set this up in the shipping options. Flat rate just charges $60 for their entire order regardless of how many different materials are ordered. Charging by weight won't work because they could put a variety of materials in their cart and still only pay $60 for delivery.
Ideally it would look like this:
6 yards mulch $123
2 tons 57 limestone $95
Tax $13.34
Delivery $120
