Best way to source concrete for a long fence project
Delivery of ready-mix in a truck
This gets you a whole lot of mud fast. There are a couple of problems: First, the &quot;short&quot; (small) load fee may raise its cost by 50% compared to the per-yard price you were quoted. Second, they'll likely allow you something like 5-10 minutes per yard to unload the truck and may charge by the minute if you run over time. The unloading process may be sped up if you have several laborers running with wheelbarrows. Third, if the unloading is slow, not only might you pay an extra fee but you might also have the mud setting up in the truck (recall that concrete hardens through a chemical reaction, not through &quot;drying&quot;). This could be mitigated by requesting the mix have a retarder to extend its initial set time.
You-haul ready mix in a trailer
There may be a small-batch concrete provider in your market. They have little 1-2 yard mixer trailers; you bring a heavy-duty pickup truck and tow their trailer to your job site while it mixes. It's heavy; the empty trailer might weigh 3500 pounds and the concrete another 3700 pounds per yard. You could buy just one yard at a time (or even less) and make several trips to ensure that you have relatively fresh concrete throughout the job.
Portable mixer
Honestly.. this is the one I'd do. The main reason is that I frequently work alone or with one assistant, and this approach is the only one I consider practical for such a small &quot;crew.&quot; Rent/borrow/buy a mixer large enough to do the concrete for 4-6 posts. (Could buy a used one and resell it when you're through.) Put a pile of sand and gravel on a flat bed trailer along with the mixer, bagged Portland cement, and a few buckets of water. Tow it around the parking lot as the job progresses. You can pipeline the job a bit by dumping the entire mixed batch out into a wheelbarrow or a few buckets -- then you can let the mixer run making a new batch while you're placing the concrete mixed in the prior batch. Size the batches so that the mixing time roughly equals your placing time and all of that is well below the initial setting time.