Hey Dan,
I'm assuming you're asking about the AccuAir ride height sensor placement? There are a myriad options for mounting these and it all depends on your creativity, function and the space/room you have to work with on your vehicle. Since the C10 has been done so many times and there are many ways people have done it, it's just a matter of going with whats worked or done before.
In my case, Dave from PB sent me a few sample pics of how they commonly set their sensors up and I loosely based it on that.
Again, there are so many options to mount these(which is the beauty and the downside of them, lol) but here are pics of my set up.
Front:
Rear:
I'm keeping an open mind as to the efficiency and reliability of my placement just in case these weren't optimal and need to relocate or modify it, but so far, they seem to be working fine and keeping the sensors in their 'sweet spot' of its range.
Hope that helps a bit...