Call a concrete pumping company just to see how much they charge. It may end up being cheaper than a rental yard where you'll have to end up with a day's charges because you'll have to work your pour and clean the pump & hose before returning it. One truck load will be poured in an hour or less, likely only a few hours worth of pumper charges.
The pumps used in my shop construction were all trailer type pumps with hose laid out on the ground. Although, the longest run they made at my place was just a tad over 100'. Largest pour was about 40 yards--four trucks worth. Grand total of four pours--one for slab, one for walkways and short back drive, two for the 120' driveway.
One thing good about a pumping company is you get another guy on the job. The pump operator runs the end of the hose spitting out the concrete. He has a radio control for remote operation of the pumping machine.
The cost of a pumper may be less than you think if you factor in the paid truck waiting time.