Idunno... I helped keep up with a couple that were used as actual trucks and they had lots of dumb stuff wear out. Fuel pumps, transmissions, transfer cases, inner dash structure cracking at 6 or 7 years old, rocks played hell on the aluminum coated parts of the grille, later ones with the a/c vent motors, DRLs liked to crap out a lot, paint on ours was ok but others had clear coat issues, one snapped the head off a driver's seat bolt somehow and I remember the '94 had driver door hinge issues once it turned 7.
The actual engines were good and the A/C blew cold anyway.