I've been reading and watching videos about power steering boxes and pumps. I'm starting to suspect that the pressure relieve valve in my PS pump is bypassing when the strain on the steering gets too great. This would explain why I experienced a loss of steering several times during the trip. Every time it was when I was in a difficult obstacle, and the locker was locked. Sometimes I had problems steering left, other times right. I don't remember it happening in both directions at the same time, but I could be mistaken.
If this is the case, I know I can make some adjustments to the flow/pressure valve in the pump, but at this time it's just "stock" out of the box. From what I understand, hydro assist would also prevent this problem by taking the stress off the steering gear. I'm also running hydroboost so there is some extra demand on the system, so I need to make sure the flow is adequate once I add hydro assist. I've been running h-boost for years, but never with a locked front axle.