When I extended my back porch to build my shop, I used the Speed-E-Crete Mixer and did it with 1.5 yards on the first trip (full), and 1 yard on the second trip. I have a 6 speed diesel and boooooy was the mixer heavier that I thought.. make sure you have a tough enough truck to pull it and to stop it. I heard that a full mixer (1.5 yds) was like 8,000 lbs or something close to that. But all in all it was pretty easy to use and was a lot cheaper than paying for a full size cement truck for the amount that I needed. however I only poured about 15'x16' at approx 4" deep with 10" shovel footings around the edges, for the amount that you want to pour it will be a lot of trips.