Yet to find a ground in the rear

[Tek18 10+ year member]

unibody, you're good.

awesome //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif :d //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif :d //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif :d //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[Kangaroux 5,000+ posts]

OP, are you sure you don't have any grounding points in the rear? Lift up the carpet and you will find a ton of bolts. Make a small slit in the carpet and run your wire that way.