Might I add my $0.02?
After seeing the failures the Morgans have had in their trucks on the trails. I've come to this conclusion. I would not run a power steering box with large tires. I mean that as no disrespect to what we've discussed here. But in the two failures I've seen from them, the steering linkage has failed. (Once sheering the output shaft off the box, the other sheering the bolts off the steering arm at the knuckle) It's my opinion that the "best" solution for a large tire/off road truck would be a stock steering box fitted with a servo on the column and a hyd. ram on the axle connecting the tie rod. This would eliminate the heavy stresses on the linkage. Course, this setup would require welding, more plumbing, and cost.
I believe if I ever do a "trail deuce". I'll opt for the system I described.