[Double Venom]

Wetdog,
May I?
First, if you run the harness on the interior of the frame that leaves the area of the transmission and "driveshaft". You will find this area is very limited in space to begin with, then read all the warnings about using a drive shaft loop. even with a loop if you should break a joint or bust a drive shaft odds are way in favor of the shaft taking out a huge chunk of necessary wiring, let alone causing a major "hot" short and causing a fire.

OK, lets say we take a slight twist and put it just inside the outer frame rail...., now you have to worry about mud, snow build up OR how about just road trash getting flung up and repeating the above step A since it will be at best even with the bottom of the frame?

Not in the book, but I have found if you purchase three of four electrical plastic ties with a sleeve on one end that has a eyelet in it to allow a bolt, screw or even a large rivet through it, attack the tie about an inch from the "TOP". Do not close up the tie until ready to install the harness, just run a couple of clicks on the tie with the harness in place allowing it all to hang loose. When the body is on simply grap the end of the tie, pull sharply pulling the harness up into the body-never to be heard from again? Safe easy and semi permanent.
DV