For the quantities you need, a dump trailer may be the right way to go, although 4 yards of crusher run is going to exceed the weight capacity of most dump trailers and pickups. 2 yards is probably the weight limit, although you will be well under the volume the trailer can hold.
In the SF Bay area dump trailers rent for ~125/day. Four trips in one day should not be a problem if the quarries are nearby.
I keep my speed down to 45 mph or less with 2 yards of rock in my dump trailer. You will be amazed at how much rock weighs.
I see private trucks and dump trailers at the quarry almost every time I go there. Just take your place in line with the big boys. When the guy with the front loader picks up less than a full scoop to fill your trailer you will have some size envy, but your money is just as green as anyone's.
Before I got a dump trailer I would take the pickup and get maybe 3/4 yard of rock in the bed. No one ever said it was too small, or not to come back, even though it was a very small load. Now, shoveling it out of the bed was a chore for sure.