I bought a set of chains for my 31x10.5 BFG AT tires in 1978. I have gone through the FJ55 Landcruiser, an 89 Ranger 4WD and am on my current Ranger and the chains still look like new. Maybe the reason is; the only time they were on was when I checked to see if they would fit the original Landcruiser they were intended for.
With 4WD I have never had to put them on. I have been asked if I had them with me at "chain required" check points. I did and they let me go, so I guess they have served a purpose. It is also comforting to know that I have them if I ever get caught in icy conditions.
2002 FX4 Bright Red Supercab 4.0 SOHC, manual 5-spd & Tcase, 33" BFG MTs, K&N air filter, Modified air box inlet, Gibson SS cat. back exhaust, Bama flash, Hidden Hitch round receiver, Rear helper air springs, Electric trailer brake controller, Line-X bed liner, WAAG bar with KC lights and Wildernest shell.