Some notes and questions about your picture:

It is almost impossible not to cross a power wire of some sort and a speaker or RCA cable somewhere in your truck. Crossing lines like that shouldn't cause a problem anyway as long as your wires are shielded.

What I'm wondering is what the red wires are? The gold and blue are obviosly speaker lines and the blue appears to be good quality wire. But what are the red wires for? I sure hope those aren't power supply wires!

What really, really disturbs me is the lack of thought and pure carelessness that is obvious here. It appears that this shop made no effort to follow any form and pretty much just tossed the wires in. And the strapping tape used to hold them in place is just plain old pathetic. So, my thought is that if they are careless enough to run that wire that way in that spot, what does the rest of it look like? I can just imagine that wire rubbing there between the seat bottom and the sharp edge of the fuel sending unit cover...yikes!!!