A frac spread is the equipment used for fraccing. In a US shale...

A frac spread is the equipment used for fraccing. In a US shale gas frac comprises several dozen trucks and shipping containers. It's a truly massive operation.

A CSG frac, or a frac in a conventional gas well, are tiny by comparison. A couple of trucks normally.

Here are a couple of photos:

Australian CSG frac:
http://www.drillingcontractor.org/australia-embarks-on-coal-seam-gas-the-next-ep-frontier-down-under-10660

US Shale frac (second pic):
http://www.kgs.ku.edu/Publications/PIC/pic32.html

You can fill in the gaps yourself as the cost of mobilising the equipment in the second link to the middle of the Outback with no supporting infrastructure.