How can I easily arrange all my Fences?

Does anyone know of a way to automatically select a bunch of Fences and arrange them automatically?

Even when I have the "snap" set they don't come out exactly the same width when pulled manually.

Also, the gap between each one is slightly different.

I just want to be able to select them all and tell the program to make them 4 icons wide and 40 pixels apart.

I suspect it can't be done but tech support won't give me a straight answer and are insisting I use the forum.