My 1972 CJ5 has a fiberglass tub, but fenders, hood, grill, and windshield frame, all steel. I do all kinds of offroading with it, including jeep jamborees...no problems. Just depends on how it is mounted and maintained. In fact, my tub is at least 25 years old from 4wd. If it is a 1976 and up, the frames go bad in the back, just like a yj. If it is pre-76, the frames are not boxed, they are open C-channel, and are known to bend and be twisted, but they last longer. Also, pre 76 are usually narrow track, 76 and up are wide track axles. Stay away from the 4cyl. Worse than the current 4 bangers in wranglers. Mine has the original v8, manual steering, and manual brakes...and I love to here people comment on what I do with it. I like it that way.