The front cv's are plenty strong, providing you wheel from a technical standpoint, and not a throttle down one.  I run a lunchbox locker in the front of my '91, and even w/35's the cv's have held up w/o issue, it was the same for a buddy who ran an ARB in the front of his rig w/35's.  I carry spare axles/hubs/steering components for my '91, but then again you would be carrying spares for a SA just the same.  The idler arm is the most wearable issue, I would recommend buying one w/a lifetime warranty like the ones by Moog.  Since going to Moog, I haven't bought a new one for the last 12yrs, replaced them a few times each though.  The Moog arm is bigger and doesn't bend as easily, but it can still be bent under hard use.  Knocking the toe out of alignment is relatively easy to do when wheeling, so be prepared to check/align the front end before heading home after a wheeling trip.

Even in its stock form an IFS Toyota is a pretty capable rig.  Here are a few shots from 1990 of my stock rig on Fordyce Creek trail.