I have been getting TT loads of bulk for 37 years and understand that you cannot ask any responsible truck driver to dump his trailer unless the site is essentially flat. If you can't understand the concept, then don't call for bulk coal.
If is not reasonable for you to expect a tri-axle driver hauling gravel or stone to chance flopping his load, and TT units are LOOOOONG and top heavy. Wires, tree limbs, adjacent buildings, ditches, blah, blah, blah.
If you as a customer order the load and didn't take into account the restrictions, you are still liable for the shipment.
Use your head, cover your stump before you .......! If anyone needs to get together for this fall and wants folks to share in load costs, let's get together...SOON! I have 3 loads scheduled in Oct....all bulk. PM me if you like.