I've done several small fence projects before, and hand-mixed concrete in a wheelbarrow for each post as I set them in place.
However, I'm now looking to build a wood guardrail around a parking lot at work, that requires 73 6"x6" posts. I'm going to need about 1.8 yards of concrete for the job. Hand-mixing is definitely out of the question, and it seems that delivered, premixed concrete is substantially less expensive than bags anyway.
I've never worked with a concrete truck before. I know that trucks supply premixed concrete for large areas like slab foundations, but is out out of the norm to have a truck come and fill each hole as we set each post? Of course, I'd have all the holes ready to go with posts in them and a level line set up, but this would still require the truck driving up to and stopping at 73 different spots within the parking lot, to deliver a small amount of concrete to each hole. A lot more time and effort than delivering an equal amount of concrete to a slab.
I've seen rentals of concrete mixing trailers, and of course, the rentable concrete mixers from the big box stores. It seems like there are several ways to skin this cat. What is generally most cost effective, efficient, or both? What would you do?