This has bothered me for 14 years. I finally got around to making a shield for our propane tank that was always fully exposed to the rear tires as shown here.
I bought a truck mud flap from a truck stop during one of our vacations.
I measured and cut out my shield, first with my table saw, followed with a large scissors for the detail work.
I used a generic perforated bracket for mounting it.
I used hardware I had around the house including nylon locking lug nuts.
Cost was only that of the mud flap which as I recall was around $25.
I assembled it followed by a final fitting, then decided to adjust the lower-right area for improved clearance to the leaf springs and parking brake cable.
Here it is installed and the project finished.
I screwed the perforated bracket up into and through the PC wheel well liner into the steel above it. It wasn't too thick, the large screw was able to self-tap into it. I got lucky, in that there was a large production hole in the thick hardened steel main cross frame to allow the screw to the far right to pass through it into the steel above.
