Fiberglass bodies

That would be one factor. Cost is another. A steel tub for a `67 through `83 CJ-5 costs between $2500 and $3500 and, since it is a "universal fit", you've got a couple of days of shop time making it fit your application. A basic `glass tub for the same Jeep costs $1300, $1900 for Kevlar.

Not all `glass tubs are well made, I've seen old ones delaminate at the wood inserts. Since there's no metal for a ground path, all electrical devices need a hard-wired ground. For one of the main reasons I went with steel over glass on my new tub, visit a Jeep boneyard. Glass bodies just shatter when they get hit.

You pays your money, you takes your chances, either way.

I am sure that if I had a FG body, it would be pretty much toast by now. As it is, my metal body is bent in almost every flat place. Metal will bend out of the way, plastic will break off. You decide ...