Why does everyone act like fiberglass will break apart if you look at it funny? Given the choice I prefer clean steel too, but there's really nothing wrong with fiberglass either. Fiberglass is going to survive a little contact offroad with maybe some scratches that would dent a steel body. I'm talking about normal offroad crawling contact here, not driving into a brick wall at high speed of course. Its a little more forgiving than thin gauge sheet metal IMHO.
'94 YJ - SBC/AX15/231, SOA, 8.8, 34" swampers
'06 LJ Rubicon - 31" ATs, OME 2.5", belly-up skid, other junk
'75 CJ5 - 232/T14/D20, 'glass tub w/ 2" BL, otherwise stock