Your'e pretty save in a wagon ( ie 60/ 80/ 100 etc), but in a pick-up or any kind of removeable top ( ie. 73 & 74) you only have 1 supporting pillar to pretect you. Remember the winscreen isn't protection, only the pillars that follow there after.
I'd agree that the 75 series pickup is a death trap in a roll, the 79 series is built better though - just from what I have seen when having them both apart. The 75 cab scares the s*** out of me - and I wouldnt have one unless I installed a roll bar in the back.