Billy check the vids - it looks like there's a speed element to these events - not just rock crawling - so high speed (relatively speaking) handling is a factor. Doesn't a locker in front adversely effect handling? That's why I was thinking locker in back and LSD in the front would be ideal.
Going up steep hills when traction is critical, weight bias shifts to the rear so the locked diff would be feeding torque through stronger components to the tires with the most traction. Meanwhile the front with LSD would slip a little when needed which would yield better handling in tight corners and also hopefully keep the driveline intact for the whole race. From what I've gathered, the CVs are a weak link and front lockers put a lot more stress on them...
But hey - I'm not an off-road VXer - I readily admit I've never driven a VX (or anything else) that had a locker - so this is all theory. Considering Redlyner is interested in going fast rather than crawling, what are your thoughts?