I started a small Bark Mulch resale business, I buy my mulch from a local supplier, who loads my truck. The question I have is, I measured the dump body on the truck and according to my calculations if they loaded my truck even with the extended side boards this truck holds 7.5 yards. The most they can load on it without the load spilling over the sides is 6 yards, do I go according to amount they say they loaded or do I sell the load for the amount the dump body mathematically holds (7.5 yards). I have noticed that the bucket on the loader is not heaping but it is not leveled off either.. What are your thoughts??????