About 40 years ago I bought a Jerry can holder, that I still have. I haven't seen anything like it in many years. It is still mounted to my CJ3A. Very simple design and works extremely well. Carried a Jerry can for 20 years and never lost one. It is a 4"x 1/8" plate, probable 24" long. It has a small curled up lip on the bottom to fit the lip around the bottom of he can and a 90 degree bent carrage bolt on the top to secure the can. No rattle no movement.
I'll post a picture this weekend. Somebody ought to make them again.
1985 CJ7 - total customization underway, Sublime green and Plum crazy purple, Ford 9", 258 w/ Holley 475
1985,93 CJ7,YJ - L98 TPI Vette motor, Atlas twin stick, Dana 60s front and rear, Arbs, 39.5 Swampers