We removed the sod, and a couple inches of top soil.
Then we installed a few inches of sand, leveled it off, and tamped it down, then set the pad on top of the sand.
Installing the pad itself was a breeze. Getting the sand level was the most challenging part of the install.
The pad comes in two parts, with a thick, wide tape to connect the halves.
I work with the person who owns the pad. If I run into him I'll ask him how the pad is holding up.
Brewman