I didn't see if anyone had answered your query anywhere about wider axles, so i thought I'd pipe up just in case.
I put HJ61 (FJ62) axles under my LX with factory cable lockers which I got when I was still living in Australia. Cable lockers aside, I LOVE the wider axles on my LX; it tracks better, does not jump from rut to rut on degraded roads and corners better. I have not had a chance to get her really off cambre yet, but on side slopes of up to 30° it feels really stable.
The rear axle is obviously quite easy: move the perches in 1" each. The front is a bit more involved as you have to move the frame hangers outboard 1" each (at which time I also moved the hangers/axle forward 9/16" to compliment the 2" rearward move of the rear axle, giving me almost a 93" wheel base).
The most surprising result I found was that the rig is much smoother on rutted dirt roads. I believe this is because the springs are now further outboard and thus the torsion from the axles is spread out over a larger area. I am at a bit of a loss as to why this is, but I am grateful that it is so.
If I had realised just how nice these axles were on a 40 earlier, I would have put them on every 40 I've ever owned.