Welcome from another Illinoisan. Good to have you. Very nice truck. Love that paint! I have had two AD 3/4-ton pickups with curbside spare tire mounts. Both appeared to be home/shop made. Not as easy to lower the rear of a 3600 as a 3100, since you can't add lowering blocks. Keep us informed how that comes out.
Good luck with your truck!


Professional Novice