I also built a mini-crossmember for underneath the truck, that will be a mounting point for the rear section of my exhaust. I wasn't happy with mounting it any other place so I decided to just make my own out of a few pieces of scrap metal.
First arm
Second arm, test fitting
Both sides are fitting well
Cross brace tacked on
More weld porn. Not too bad for a little 110v welder running on a 15A outlet
All fabbed up, and mounting tabs welded on
And going in for paint!