Jwestpro
Explorer
Not sure if its got the HD package or not. The spare was still mounted underneath, but I didn't notice if it was a full size or smaller. Even after googling "rear diff locker LR3", I still wouldn't know what or where to look for to determine if it's on this vehicle or not. That would be a very pleasant surprise to discover it is HD.
Michael
Don't worry about the HD unless you just want to use it as a negotiation point to buy lower. ARB makes their air locker now for both front and rear on lr3, front only so far on lr4. The part is about $1100 plus air compressor and installation. This is a "logic" issue, meaning that if you actually "need" a locker, you are probably in an area where you also should have available an air supply so it might as well be a built in compressor. Having your own on board air supply, ideally into a holding tank, is one of the top mods in my opinion, other than larger 18" tires and a dual battery to power a fridge.
Anyway, a clean vehicle with good history and the right price in the colors you want is WAY more important than the HD/rear locker. I don't even consider the HD much of a $ value at this point on an HSE because that 5th wheel is not a useful 18" or useful tire. At best I find it worth about $100 for the tire pressure sensor
In all the places I've gone through, I've never been stuck needing the rear to lock.